Database Develop

[OPINION] Do not overcharge battery!

Hi all!
I was browsing through Samsung Galaxy S's Android Development Section when I saw this:
"11. Do NOT overcharge
--Why, when, where: Almost all new batteries have an overcharging protection. This means that the protection that is built into the battery will not let it charge to 100%. This is a feature, not a bug! This will help prolong your battery life while also keeping it safe from overheating/explosion/etc. Do not try to trick it and unplug and plug again until you see 100%, just get used to the fact that you can't have 100% battery anymore and live with it, or you risk destroying your battery."
posted by user "shantzu"
here:http://forum.xda-developers.com/showthread.php?t=939752
I did "calibrate" my battery many times lately by unplugging it when charging and the replugging it. But I sure know I wont do it anymore! It's your choice whether or not you wanna do it!
I just wanted you to know this! Hope I've been helpful!

Cool story bro
Sent from my Dell Streak using XDA Premium App

pgill34 said:
Cool story bro
Sent from my Dell Streak using XDA Premium App
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+1, blablabla (sorry msg needed to be +10 characters, but it's more now and more and more and more )

eXtink said:
+1, blablabla (sorry msg needed to be +10 characters, but it's more now and more and more and more )
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I didnt say this. I just quoted and I said that I wont charge my phone to 100% with the plug-unplug way. So if you take my advise do so, if you don't want to take it please stop posting ****!

vladstercr said:
I didnt say this. I just quoted and I said that I wont charge my phone to 100% with the plug-unplug way. So if you take my advise do so, if you don't want to take it please stop posting ****!
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I dont think he was posting ****. He just wanted to post "+1" (as in "me too"), but needed to respect the minimum character limit for a post.
Badly worded, but it doesnt look like he was making fun of you or anything.
Sent from my Milestone using Tapatalk

I love this thread already
Isn't calibrating the battery all about fixing an Android bug?
Anyway, this reminds me, the Milestone overstates the full charge mV and underestimates the low battery mV.
So, if Battery Monitor Widget reports that I have 4230mV when it's fully charge and plugged in... it's really only 4170mV.
When it's reporting empty at 3200mV, it's really at 3300mV.
http://www.android-hilfe.de/root-ha...ku-infos-ladekurven-leistungsverbraucher.html
Externally measured or indication of the internal voltage measurement
3.30 volts / 3.20 volts
4.12 volts / 4.18 volts
That is, the stone over-estimated the voltage at the battery is full by ~ 60 mV and underestimated the power of up to 100 mV with an empty battery. The intent is well-battery protection (which is good too). It is pretended that 3.0 and 4.2 volts to discharge until it is loaded. In reality, there are more 3.1 volts and 4.15 volts (which by the way of battery manufacturers also better unanimous opinion!).
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Apparently, we are still protected even if we do calibrate the battery.
I'm pretty sure that Payce at android-hilfe actually took that battery out of his phone so I'll go with that.

Thanks for sharing

Good article

Over charging doesn't effect Lithium Ion batterys;
http://en.wikipedia.org/wiki/Lithium-ion_battery

DannyDroid said:
Over charging doesn't effect Lithium Ion batterys;
http://en.wikipedia.org/wiki/Lithium-ion_battery
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Gee thank you! I just wanted to start correcting this non-sense. The "overcharging" affects Lithium-Polymer batteries, not Lithium-Ion, so calibrating battery is HARMLESS!!!!
If you have a Samsung Galaxy S then you have this possibility.
I think we can close this thread.

Actually you can overcharge (any) battery, charging it to the higher voltages for higher capacity when used daily (as cell phones).
However it lowers total lifetime of the battery, but you can get more battery time.
But this isn't the cell phones' thing. IMHO charging circuit + circuits in battery won't allow you to do this. So you can't really overcharge.
This "calibrating" is even suggested by notebook manufacturers - you have to do full discharge -> full charge to set the voltage "limits" for 0% and 100%, so the battery indicator can estimate the remaining battery % precisely.
Just few quotations from http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries to support my opinions:
"In terms of optimal longevity, a charge voltage limit of 3.92V/cell works best but the capacity would be low."
"Should I disconnect my laptop from the power grid when not in use? Under normal circumstances this should not be necessary because once the lithium-ion battery is full, a correctly functioning charger will discontinue the charge and will only engage when the battery voltage drops to a low level."
"Partial discharge on Li-ion is fine; there is no memory and the battery does not need periodic full discharge cycles other than to calibrate the fuel gauge on a smart battery."

The milestone has a Lithium-ion polymer battery which looks like they do suffer from over charging.
"It is important to note that trickle charging is not acceptable for lithium batteries; Li-ion chemistry cannot accept an overcharge without causing damage to the cell, possibly plating out lithium metal and becoming hazardous.[5] Most manufacturers claim a maximum and minimum voltage of 4.23 and 3.0 volts per cell. Taking any cell outside these limits can reduce the cell's capacity and ability to deliver full rated current.
Most dedicated lithium polymer chargers use a charge timer for safety; this cuts the charge after a predefined time (typically 90 minutes)."
http://en.wikipedia.org/wiki/Lithium-ion_polymer_battery
Someone will have to dig deeper into the OEM charger to see if it has some sort of cut off.

the thing with timer seems pretty weird to me. Try charging your battery with very little current - why should you cut it off after 90 minutes? Makes no sense to me, but I'm not an engineer so there may be a fact I overlook.
At the same time with noting overcharge will damage battery cell you should point out that there is no way to overcharge the battery without charging the battery CELLS itselves (not whole battery pack with its circuitry) with your custom charger without monitoring voltage/current.
However - yes, you're right, battery cells can be damaged.

I assume it would be the charging unit itself (i.e. the plug) which as the 90min cut off.
Charging via a USB takes ages (supplied at 5V) and without the "plug" it prob wouldn't have a cut off so the chances of over charging would be higher but would require leaving it in for longer.
I'm not sure, I'm only a first year electriton and haven't touched on batterys.

DannyDroid said:
Charging via a USB takes ages (supplied at 5V)
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The "plug" is just 230V~ -> 5V- transformer so the only difference is current, supplied voltage is the same. Btw I leave my phone in cradle for extended periods of time (24h+) and nothing bad happened. When it's at 100% it stops charging so I don't expect anything to happen.
Same with notebooks - it charges to 100% and stops. E.g. HP does stop charging until battery level drops to 90% so it won't "trickle charge" or do many 99%->100% cycles. Dunno how does the phone charging work, because it says 100% all the time. This can be possibly a bad thing

[Q] 100% battery voltage?

I've searched the captivate threads and couldn't find the answer, then again maybe I have just overlooked it. I've seen people talking about the % of the battery but not what the actual voltage should be for a fully charged battery for the captivate. Anyone know?

Mine is somewhere around 4.2 V I think. I'll update this when I find out the exact value. I view this with the phone tester app from the market. How are you viewing yours?
Edit: Fully charged my phone is at 4.187 V or 4187 mV

Fully charged mine was always around 4185mv.

My voltage is about 4191, my wifes its about 4210. Both are captivates.

Voltage is not as important as capacity. Ohms law makes the voltage fluctuate.
Sent from my GT-I9100 using XDA App

ok, just wondering because sometimes even after doing the calibrations at 100 percent it would read about 4000v and drop quickly along with the percentage, other times 100% would read around that 4200 number you guys are saying yours are at. fancy widgets, simi clock, and beautiful widget all have a battery stat option to view it.

pawadca said:
Ohms law makes the voltage fluctuate.
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Yep, but voltage is what apps use to gauge battery life.
I've seen mine top out anywhere from 4125~4275. Also if your wondering the bottom value seems to be between 3650~3525. Least this is where it always cut out at on stock 2.2.

All phones are different in their own way. Including batteries, I suggest getting a good battery statistics app which can tell you all your need to know information.
Sent from my SAMSUNG-SGH-I897 using XDA Premium App

pawadca said:
Voltage is not as important as capacity. Ohms law makes the voltage fluctuate.
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Very true. Using voltage is like guessing when the water is going to stop coming out of a hose by measuring pressure. More resistance = more pressure, or lower power = higher voltage. Pressure has little to do with capacity.
At near full charge it should be 4235mV (pressure from charging) then drop to around 4100-4180mV when it completes and switches off or you unplug it.
The phone does use V to trigger events though. 3500mV is the shutdown trigger and when it's pretty close to full you can trigger the battery full message by turning the screen off and on. Or at least that's what I've noticed with the current kernel I'm using, which kind of sucks. I was assuming it could read the charger state rather than guess by noticing a small drop (assuming the charger stopped). The charge circuit works using accurate current and resistance measuring, so the software part is a little blind. CurrentWidget is pretty nice. It only shows the charging current, not drain. But it can show when the battery is being charged and when it actually completes.

@CuriusTech
That helped a lot. Thank you kind sir.
sent from a cabin in space using GR-10

Solar back?

The design of the Streak seems like it could fairly easily take a back with a solar charger built in. Has anyone seen something like that?
Sent from my Dell Streak using XDA App

I think you would have difficulty finding a solar panel small enough with enough power output to do any good, not to mention having to leave it out in the heat of the sun while it charged.

Good point.
Buts not about replacing the mains charger but adding a little charge while out and about. Prob get a few days extra with solar panel. Unless you forget to take it out of your pocket
I think its a great idea. Maybe a battery with built in cover/solar panel
Sent from my Dell Streak using Tapatalk

does sounds like a good idea you can already get solar phone chargers but one attached to the phone would be great!!

you'd probably be better off looking for one of those solar power batteries that could charge an internal battery, then use it to charge the streak once the charge is up

Solar chargers work under indoor lighting also. My watch never dies on me and I'm indoors all the time. As long as you left the unit face down, it would trickle charge and maybe get enough extra time to never worry about dying out before you get home to your charger.

mid_life_crisis said:
Solar chargers work under indoor lighting also. My watch never dies on me and I'm indoors all the time. As long as you left the unit face down, it would trickle charge and maybe get enough extra time to never worry about dying out before you get home to your charger.
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Problem is the Streak needs an awful lot more power than a watch. I see this panel on eBay http://www.ebay.com.au/itm/5V-150mA...895?pt=LH_DefaultDomain_0&hash=item4aacb1b777 which they say is 5v 150ma and it's 110mm x 56mm. This is roughly the size of the battery cover on the Streak, but you would need 7 times as much current to successfully charge it.

Troute said:
Problem is the Streak needs an awful lot more power than a watch. I see this panel on eBay http://www.ebay.com.au/itm/5V-150mA...895?pt=LH_DefaultDomain_0&hash=item4aacb1b777 which they say is 5v 150ma and it's 110mm x 56mm. This is roughly the size of the battery cover on the Streak, but you would need 7 times as much current to successfully charge it.
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What if you combined this with the battery idea? So it would charge a second smaller battery, and when your battery was running low you flipped a switch to charge the streak from that? It would start to get bulky but might work?

not a new idea or device... see:
http://www.powerbee.co.uk/Solar-Phone-Chargers/Powerpod-Solar-Phone-Charger/p-84-355/
http://www.amazon.com/Premium-Solar-Charger-Built-Windshield/dp/B00449U3K0/ref=pd_cp_e_0
http://www.ecoexpress.com/page-1440-ECO SHOPS-1101.htm
http://www.amazon.com/i-Sound-Portable-iPhone-Blackberry-Silver/dp/B00439G3WS/ref=pd_cp_e_2
etc...

I bought two extra charging cables. One for the car, one for work and the original stays at home by my computer. Charging problem solved with nothing to lug around. This thing is big enough without toting around accessories.

Troute said:
Problem is the Streak needs an awful lot more power than a watch. I see this panel on eBay http://www.ebay.com.au/itm/5V-150mA...895?pt=LH_DefaultDomain_0&hash=item4aacb1b777 which they say is 5v 150ma and it's 110mm x 56mm. This is roughly the size of the battery cover on the Streak, but you would need 7 times as much current to successfully charge it.
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No you wouldn't, it would charge with only 150ma, it would just take about 10 hours for full charge, in reality, something like this would only slow battery drain on a "super"-phone like this.

That's my point - not to charge from dead, but to top up and maybe get an extra hour or more before searching for an outlet.
Sent from my Dell Streak using XDA App

Aren't there serious problems with trying to trickle charge Lithium ION cells? As in, it kills them pretty quickly?
Isn't that why loads of modern kit has normal and fast charge modes, depending on what the available amperage on the cable is, and why some things, e.g. iPad, cannot charge at all from some USB ports?

As far as I know the only thing you don't want to do to a lithium battery is let it discharge fully, that shortens the battery life considerably.

Troute said:
As far as I know the only thing you don't want to do to a lithium battery is let it discharge fully, that shortens the battery life considerably.
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This didn't make sense to me, so I Googled. It is correct. I found this quote on a battery research site.
"Similar to a mechanical device that wears out faster with heavy use, so also does the depth of discharge (DoD) determine the cycle count. The smaller the depth of discharge, the longer the battery will last. If at all possible, avoid frequent full discharges and charge more often between uses. If full discharges cannot be avoided, try utilizing a larger battery. Partial discharge on Li-ion is fine; there is no memory and the battery does not need periodic full discharge cycles other than to calibrate the fuel gauge on a smart battery."
There was a chart that indicated that discharging only to 50% as opposed to until it dies can triple the battery life.
The moral is to have it on a charger whenever possible.

Well, according to http://batteryuniversity.com/learn/article/charging_lithium_ion_batteries
A continuous trickle charge would cause plating of metallic lithium, and this could compromise safety.
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It is referring to when they are fully charged, but you would definitely have to cope with that situation, since that's a recipe for exploding batteries, otherwise

mid_life_crisis said:
The moral is to have it on a charger whenever possible.
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After reading that article, this statement I made previously is clearly wrong.
What I gathered from the article is that for max lifespan of the battery, a couple of things should be done:
1) Do not completely discharge.
2) Turn the phone off while charging.
Of course with the Streak it would be impractical to do both of these, as it would mean turning your phone off for an hour or so in the middle of the day.
Oh yeah, and hope like hell that Dell did a good job designing the charger circuitry.

p_razzi said:
The design of the Streak seems like it could fairly easily take a back with a solar charger built in. Has anyone seen something like that?
Sent from my Dell Streak using XDA App
Click to expand...
Click to collapse
http://batteryuniversity.com/learn/article/charging_with_solar_and_turbine

Its still a great idea, free energy, even if its only 10mins
Sent from my Dell Streak using Tapatalk

A seperate solar charger might be useful but there's another potential problem with a built in one, that is having to leave the phone lying in the sun for long periods of time, never a good idea.

[KERNEL PATCH] - Force AC (fast) or USB(slow) charging

This is for kernel devs only. The patch itself is useless to those who do not/can not compile their own kernel.
This patch allows one to force AC or USB charging for any charger. It also provides additional security when connecting to public charging stations because with either force AC or force USB mode on, USB transfers are disabled, protecting your data.
Fast charge can be toggled by issuing:
echo 1 > /sys/kernel/fast_charge/force_charge_mode
Slow charge:
echo 2 > /sys/kernel/fast_charge/force_charge_mode
and off:
echo 0 > /sys/kernel/fast_charge/force_charge_mode
Plug your phone into the charger AFTER toggling the desired mode.
In addition I have created a toggle fast charge widget that may be used to toggle fast/slow charge on and off right from your home screen:
https://play.google.com/store/apps/details?id=com.incredicontrol.fastchargewidget
I have not yet implemented the three way toggle into incredicontrol (free), but I will be. I have to change it to support slow charge also and haven't yet gotten the chance to. I will be implementing it when I get the chance though so you guys have a convenient free way to toggle also.
For the widget (or any fast/slow charge toggle) to work, you MUST be running a kernel that has this patch implemented.
As a good gesture to support a fellow dev, I ask that if you implement the patch into your kernel, please link to my widget as one means to toggle it. You are of course free to provide other ways to toggle it as well if you so desire.
Kernel devs, if you would like to test the widget yourself to confirm its working, and for convenience of testing, please contact me and I will provide you with a copy. You must show that you are a kernel dev though (i.e. link me to your kernel post so I can match your username).
Good luck have fun!
http://www.incredikernel.com/wp-con...r/download.php?id=o2x_force_fast_charge.patch
Here is the neoblaze kernel (stock froyo/gb, not AOSP) patched with the mod so that you guys can test. I will not be supporting anything regarding this kernel except the charging mod itself!
http://chad0989.dyndns.org/mirror/o2x_fastcharge_test_neoblaze2.zip

Sounds interesting even though i dont own a car!

langhaardack said:
Sounds interesting even though i dont own a car!
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Its not necessarily just for car chargers, that's just the easiest example. It can be used with any charger that is detected as USB. Some powered hubs for example can easily put out 1A but would still be limited to 500mA by the phone. The patch will allow you to toggle force AC mode on/off via an app or widget.

Ya i got that but the only usb-charger besides the outlet that i use is my laptop, and i use it only for transferring files. still a great idea!

In other words. If you will be using USB port and cable as current source, The specification asks for Data + and - to be shortcut. And normally phone detects it and also the fifth sense pin and then high current charging must kick in. (although our LG phone uses also it to enter download mode)
If you use the widget and enable high current charging, you'll fry out your motherboards USB port probably...
Another warning. If someone has read about Lithium Cell charging methods AVR based documentation for example. Such high current charging decreases your battery cycle life. So consider those facts first of all!
And those with car chargers... especially cheap ones... in most of these devices are SMD LM317 or LM7805 etc family inside... it will dissipate [email protected]=7W so these sticks will fry out and also blow up despite it can deliver 1.5A - the catch is with proper heat sink.
So So So... dear coders... consult your hardware guys before acting for the good deeds... the cons are more than the gain.

Ferrum Master said:
In other words. If you will be using USB port and cable as current source, The specification asks for Data + and - to be shortcut. And normally phone detects it and also the fifth sense pin and then high current charging must kick in. (although our LG phone uses also it to enter download mode)
If you use the widget and enable high current charging, you'll fry out your motherboards USB port probably...
Another warning. If someone has read about Lithium Cell charging methods AVR based documentation for example. Such high current charging decreases your battery cycle life. So consider those facts first of all!
And those with car chargers... especially cheap ones... in most of these devices are SMD LM317 or LM7805 etc family inside... it will dissipate [email protected]=7W so these sticks will fry out and also blow up despite it can deliver 1.5A - the catch is with proper heat sink.
So So So... dear coders... consult your hardware guys before acting for the good deeds... the cons are more than the gain.
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Absolutely not. It would have no negative effects on your battery at all as the current isn't increased beyond what it is for AC charging.
Also you notice nowhere that my recommendations were for using it to charge from a motherboard. Despite that, the current pulled from the board is ultimately limited to the fuse at the port. Even if a device successfully tries to pull more than the board can provide (which the board won't put out anyway), the PPTC will cut off power to the device.
So So dear hardware guys, please read before jumping all over someone.

chad0989 said:
Absolutely not. It would have no negative effects on your battery at all as the current isn't increased beyond what it is for AC charging.
Also you notice nowhere that my recommendations were for using it to charge from a motherboard. Despite that, the current pulled from the board is ultimately limited to the fuse at the port. Even if a device successfully tries to pull more than the board can provide (which the board won't put out anyway), the PPTC will cut off power to the device.
So hardware guy, how about you read before jumping all over something.
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Then please why I have to repair broken motherboards that Ipad2 have fried a lot? Why? Because they are cheap mate, and fuse is the last resort. And No current limitations aren't implemented there...
I said once again. This 0.5A setting is the most green one, as many manufacturer use as a law!
The fact that some make a PR and tell our device charges faster doesn't overthrow simple chemistry and physics. Ok it will work. Charging the cell with higher current, raises temps and other chemical emissions and it deteriorates faster! So the philosophy is simple for them, the user will kill its battery faster in order to buy a new phone eh? Nice!

Ferrum Master said:
Then please why I have to repair broken motherboards that Ipad2 have fried a lot? Why? Because they are cheap mate, and fuse is the last resort. And No current limitations aren't implemented there...
I said once again. This 0.5A setting is the most green one, as many manufacturer use as a law!
The fact that some make a PR and tell our device charges faster doesn't overthrow simple chemistry and physics. Ok it will work. Charging the cell with higher current, raises temps and other chemical emissions and it deteriorates faster! So the philosophy is simple for them, the user will kill its battery faster in order to buy a new phone eh? Nice!
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Click to collapse
I agree with you that it shouldn't be used to charge from a motherboard, although many have taken the risk without issues.
Essentially it is a software version of the charging cables with bridged data lines ("charge only") that many buy and have no issues with. I'm just bridging the data lines in software so to speak. The current draw is never increased beyond the phone's spec. The most important thing is that the end user knows the source they are drawing from is capable of providing the current.
I do appreciate your concern for the community and desire to educate everyone. We need more people like you around.
So with that, each individual can make an informed decision on their own. If anyone is still interested in the mod, shoot me a PM if you want to test.

Yup, there isn't much math to be done here.
Higher current means higher temps, and O2X already has trouble with temps as it is.
However, to each his own, and as long as people are aware of what they're doing there is no such thing as too many options... although me personally I would stay away from this one.
EDIT: Wait... so you're saying that O2X charges at 1A when connected to a wall charger and at 0.5A when connected with USB? I get the point now. So you only risk damaging the motherboard, and not the phone.
I'm guessing it would be more interesting for O2X users to do the opposite! A 'Force USB charging' because from what I see a lot of people get SoD while charging their phones overnight and this might fix it
What do you say Chad? Would you be interested in implementing this feature? I think I would use it!

chad0989 said:
I agree with you that it shouldn't be used to charge from a motherboard, although many have taken the risk without issues.
Essentially it is a software version of the charging cables with bridged data lines ("charge only") that many buy and have no issues with. I'm just bridging the data lines in software so to speak. The current draw is never increased beyond the phone's spec. The most important thing is that the end user knows the source they are drawing from is capable of providing the current.
I do appreciate your concern for the community and desire to educate everyone. We need more people like you around.
So with that, I guess each individual can make an informed decision on their own. If anyone is still interested in the mod, shoot me a PM if you want to try.
Click to expand...
Click to collapse
Yes, you have to set up proper warnings! Because there are always American(no offense) like users who will try to dry their own cat in microwave, because it wasn't prohibited in instructions . They will accuse you with headlines - you didn't say... etc - I know it from my personal work.

This is also usefull for my USB 3.0 ports am i right =D??
Sent from my MI-ONE plus using xda premium

LarsPT said:
I'm guessing it would be more interesting for O2X users to do the opposite! A 'Force USB charging' because from what I see a lot of people get SoD while charging their phones overnight and this might fix it
What do you say Chad? Would you be interested in implementing this feature? I think I would use it!
Click to expand...
Click to collapse
+1 for force 500mA mode of this would fix the overnight crashing and massive overheat that follows. I don't know if the problem is related to the current level during charging though.

owain94 said:
This is also usefull for my USB 3.0 ports am i right =D??
Sent from my MI-ONE plus using xda premium
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Your are now showing off?

Ferrum Master said:
Your are now showing off?
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Shhhtt :$
Nah just asking
LarsPT said:
I'm guessing it would be more interesting for O2X users to do the opposite! A 'Force USB charging' because from what I see a lot of people get SoD while charging their phones overnight and this might fix it
Click to expand...
Click to collapse
Vadonka and spica come here right now!!
OTF pack idea!
Sent from my LG-P990 using xda premium

forcing usb charge mode sounds like a really good idea
Verstuurd van mijn LG-P990 met Tapatalk

For so many years of using rechargeable batteries, I haven't been a fan of post-purchase "fast charging". But then again, I live in a tropical countries so non-air-conditioned room temperatures come quite warm (especially since we're entering summer now).
I must say that I love the "force USB charging" idea though. I rarely get those, but, it's another troubleshooting possibility for the many users encountering charging/overheating BSODs.

salisbury_steak said:
For so many years of using rechargeable batteries, I haven't been a fan of post-purchase "fast charging". But then again, I live in a tropical countries so non-air-conditioned room temperatures come quite warm (especially since we're entering summer now).
I must say that I love the "force USB charging" idea though. I rarely get those, but, it's another troubleshooting possibility for the many users encountering charging/overheating BSODs.
Click to expand...
Click to collapse
also if you charge the battery faster the battery life will be worse then if you charge it slow
so fast and a bit worse battery life
or fast it slow and a bit better life
you can really feel those difference if you live in a country where it is quite hot
you can try it yourself
charge one day using wall charger and charge next day using computer usb you will feel the difference

owain94 said:
also if you charge the battery faster the battery life will be worse then if you charge it slow
so fast and a bit worse battery life
or fast it slow and a bit better life
you can really feel those difference if you live in a country where it is quite hot
you can try it yourself
charge one day using wall charger and charge next day using computer usb you will feel the difference
Click to expand...
Click to collapse
Jep Owain is right... I remember old times at my work 6 years ago Nokia 8800 (RM-13), it had a tiny battery and it was the time when chargers changed from impulse type from transformer core types... so with the older slow charger the battery held for 15-30% more. (I suppose the battery is hot, and then the voltage is also artificially higher and in reality it isn't charged to its maximum).
But as I said, don't overdose with it especially with car chargers and motherboards. The phone will be fine. Battery should be changed after a year anyway... it costs for me $10 anyway...

Ferrum Master said:
But as I said, don't overdose with it especially with car chargers and motherboards. The phone will be fine. Battery should be changed after a year anyway... it costs for me $10 anyway...
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Lucky guy. The O2X battery costs roughly US$ 30 here.

So you guys are saying you get an SoD if you charge overnight on AC, but not on USB?
Reading through the battery driver it looks to me that if the battery gets too hot, it swiches to USB charge current, if it continues to be too hot, the charger turns off so I wonder if your issue is somewhere else. Anyone try to record a log (cat /proc/kmsg > /sdcard/kmsg) overnight and see if you get any messages along the lines of:
[OVERHEAT]: Change Charger setting to USB mode
or
[OVERHEAT]: Deactive Charger

Why do wall chargers take forever to charge battery?

Got it from eBay.
Charges faster in phone...while using!
If battery is around 40% it being be charged overnight.
Anyone else experience this?

could be the amp? maybe below 1 amp? Samsung charger has 2amps om it. check your charger and look for the amp. btw. the lower the amp the better for your battery..

Buy an OEM charger. The Samsung one is $50 from Samsung website but you can get the Asus charger from Google play store for $25. Both are two ampbi believe. Or you can get the 1a for $25 from samsung. Getting OEM directly from an OEM or authorized reseller or a storefront lime Google is key. Getting cheap chargers is gonna bite you in the ass one day or think about it like this. Why keep wasting time buying cheap chargers again and again when you can put up proper money and get quality in one go and have peace of mind for a few years. I even stopped buying chargers from amazon because they're just cheap knockoffs too. Phi hong makes good chargers and power supplies but they are harder to source. Phi hong came with my nexus one andy galaxy nexus OEM Home dock.
Anyways, aside from that part of the reason for slow charging is you probably have an unsafe charger that is not rated what it really is and is made of poor materials. Getting a quality 1a or higher, preferably 2a in this case and your gnote2 should charge @ 1.8a. In other words, you can charge from zero to full in ~2-2.5 hours. Or from partially full to 100% in less than 2 easily.
Sent from my GT-N7100

Unless I am mistaken, OP is referring to battery chargers, not usb chargers. That's how I charge mine, too. I have spare batteries, and they all get charged directly. When my battery is low, I just swap. I hate having my phone attached to a cord, even at night.
Yes, all the battery chargers I've had for every device (including this one) have been lower amp than the usb chargers supplied with the phone. It is especially slow for this huge battery for the Note 2. While it bothers me in concept, it's never actually been an issue for me, so I haven't done anything about it. I don't know if higher amp battery chargers are available, but I don't feel like spending extra money on one.
As far as battery health goes, charging at a lower amperage certainly isn't hurting the battery. If anything, it's actually better for it.

Yes...charging just the battery with wall charger.
@ 40% it will not be charged at 6am when I wake!!!
Are there better wall chargers?

Why do you hate having your phone attached to a Cord overnight. I heard that's fine and do it every night.!
dan_tm said:
Unless I am mistaken, OP is referring to battery chargers, not usb chargers. That's how I charge mine, too. I have spare batteries, and they all get charged directly. When my battery is low, I just swap. I hate having my phone attached to a cord, even at night.
Yes, all the battery chargers I've had for every device (including this one) have been lower amp than the usb chargers supplied with the phone. It is especially slow for this huge battery for the Note 2. While it bothers me in concept, it's never actually been an issue for me, so I haven't done anything about it. I don't know if higher amp battery chargers are available, but I don't feel like spending extra money on one.
As far as battery health goes, charging at a lower amperage certainly isn't hurting the battery. If anything, it's actually better for it.
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rockky said:
Why do you hate having your phone attached to a Cord overnight. I heard that's fine and do it every night.!
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Not for the phone, for me. It just bothers me having a wireless device locked to a wall. There's no reason for it. And I frequently get up in the night for various reasons (kids, work, insomnia, etc), and it bugs me unplugging in the middle of a charge cycle.
Incidentally, a non-removable battery was a deal breaker, and one of the reasons I didn't get a Nexus 4. I got used to never plugging in my last phone, and I don't want to go back. It was torture the first week or two with the N2 before my spare batteries arrived.

The charger should have its output printed on it, I've had a look at the pics on ebay and the first two I found that I could read were 500mA and 350mA, the original charger is 2A or 2000mA. Samsung make there own battery charger http://www.samsung.com/au/consumer/...es/EB-H1J9VNEGSTD?subsubtype=other-multimedia the output is 1.7A so much closer to the original usb charger.
I'd be worried about my back cover getting loose doing what you do. I had three batteries for my old phone, but I did not swap them on a daily basis, just when travelling or away from power for an extended time. I've ordered some wireless chargers so I can have one by my bed and another downstairs. I know they only output 500mA too, but for an overnight charge thats fine for me. I dont think there is any issue with interrupting the charge cycle, the two main enemies of lithium batteries are heat and being totally/almost discharged on a regular basis. Its best to keep them topped up.

scote said:
The charger should have its output printed on it, I've had a look at the pics on ebay and the first two I found that I could read were 500mA and 350mA, the original charger is 2A or 2000mA. Samsung make there own battery charger http://www.samsung.com/au/consumer/...es/EB-H1J9VNEGSTD?subsubtype=other-multimedia the output is 1.7A so much closer to the original usb charger.
I'd be worried about my back cover getting loose doing what you do. I had three batteries for my old phone, but I did not swap them on a daily basis, just when travelling or away from power for an extended time. I've ordered some wireless chargers so I can have one by my bed and another downstairs. I know they only output 500mA too, but for an overnight charge thats fine for me. I dont think there is any issue with interrupting the charge cycle, the two main enemies of lithium batteries are heat and being totally/almost discharged on a regular basis. Its best to keep them topped up.
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It looks like the OEM battery charger is available on ebay for around $15. That's good to know in case mine ever crap out on me. These cheapies that I get tend to.
As far as the back cover getting loose, after 3 months, it is a little bit looser than when it was new. 1.5 years with my G2x didn't loosen it at all, but the build quality on that thing was fantastic. I keep this in a case anyway, so it being a little looser goes unnoticed. If it gets bad, back cover replacements are cheap.

If one of the devs can make the kernel capable of fastcharge, it would not take but half the time to charge. Yank who is working with Faux on his kernel, helped make the kernel fast charge capable.
Sent from my SGH-T889 using xda app-developers app

UnixSlayer said:
If one of the devs can make the kernel capable of fastcharge, it would not take but half the time to charge. Yank who is working with Faux on his kernel, helped make the kernel fast charge capable.
Sent from my SGH-T889 using xda app-developers app
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But what is the point of having it charge fast, when all it is is going to drain faster?
I charge mine overnight with a charger rated at 750mah I believe and it last me a whole day. As oppose to using a 2.1 am charger I have, where the battery percentage would start dropping by the first hour.
Correct me if I am wrong here, but this is what I've notice with my last few phones.

The Perseus kernel with stweaks has the ability to change the charging parameters.
With it overclocked/undervolted I am getting better life than I did on stock.
Not for sure what you mean as it depleting the charge faster on a higher amperage charger. Kind of sounds like you may have had failing batteries, etc.

There seem to be a few misunderstandings here regarding batteries and chargers.
1) The charge rate, when the battery is in the phone, is controlled BY the phone. The charger itself just supplies regulated power to the phone. How much current is put into the battery at any given time is up to the phone, which is why kernels can do things like fast charge, it's controlled by the kernel. Now, the reason the battery charges faster when using the stock charger vs. something lower current or a computer is simple. The phone can detect what it's connected to within some limitations. It sounds like our phone can also sense the incoming voltage levels and back off if the supply becomes unstable.
2) Using the stock 2A charger is "harder" on the battery than a lower current charger. Not true, at least not within any margin of error you will be able to detect without specialized equipment. Lipo batteries are generally built to charge/discharge at 1C. C in this case stands for capacity. So our 3100mah batteries can charge at 3.1Amp and be within safety margin. So the 2Amp charger the phone comes with is perfectly fine for the battery. Without seeing a datasheet for the battery from Samsung, that's a good guess. And again, the phone controls the charge current based on a number of parameters. You could connect the phone to a 5V supply capable of 100Amp and it will still only use what it needs.
3) The percentage readout on the phone screen is a GUESS. Don't pay it too much attention. For this same reason, evaluating 3rd party batteries based on phone runtime etc is not useful. To validate the battery capacity with any accuracy requires a test setup discharging the battery through a known load and measuring how long it takes to get to a cutoff voltage. I've done some of these tests myself on stock and 3rd party batteries. In general, the OEM batteries are always at or above spec, the 3rd party battery manufacturers lie. Often by upward of 20%. Even the high $ batteries. Keep that in mind when shopping if you want extras or extended batteries.
4) Interrupting the charge cycle is bad. Nope. It's fine. On this same line of thought, full cycles ARE bad. Don't do it. Don't think too much about it either though. Just plug it in when convenient. Or set it on the wireless charger if you've installed one. Generally speaking, they actually don't like to be charged to 100% either. Keeping it at 20%-80% is actually best for the longevity of the battery cell itself. In practice, you will probably have a new phone before any of this is actually noticeable.
The OP sounds like they are talking about a stand-alone charger, where the battery is not in the phone. Those will vary wildly in quality and capability, particularly from ebay. They are probably cheap POS devices. Not that that's really a bad thing, just know about it. It's probably a very low charge rate device, perhaps even down to 100ma or so. That would take forever to charge our larger batteries. As for if there is a better one, probably. If Samsung makes one, it will probably charge faster than the phone with the provided charger plug as there would be no load from the phone using power. Of course, it will cost a lot more as well. Look for devices that at least claim they will charge at 2Amp or so. In practice, they will probably be a lot lower, but your chances are improved. Not many people will break out an ammeter and check, after all.

UnixSlayer said:
If one of the devs can make the kernel capable of fastcharge, it would not take but half the time to charge. Yank who is working with Faux on his kernel, helped make the kernel fast charge capable.
Sent from my SGH-T889 using xda app-developers app
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Perseus kernal has fast charging settings.

What ttabbal wrote is mostly correct. But the problem lies within some input voltage protection logic tied to the charger chip of the phone which is extremely (and too much so) sensitive.
rsalan said:
Perseus kernal has fast charging settings.
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Can people stop calling it fast-charge, it's an idiotic term which technically means nothing. While most kernels have some sort of charging speed configuration options, they're all useless in regard to this problem as the current in the end is decided by a different logic. You'll have to disable unstable power detection and that's the only way to make it work and fix the problem, unless you go hunting down high quality cables and chargers.
Personally I also encountered the problem as my stock S3 charger, as many others here have reported, has deteriorated and it would only charge at an effective 300mA. I disabled unstable power detection and now it charges at the full given current limits, without any issues.

rockky said:
Got it from eBay.
Charges faster in phone...while using!
If battery is around 40% it being be charged overnight.
Anyone else experience this?
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Click to collapse
You have to make sure it's "2a" charger capacity. It happened to me once. Go to monoprice.com and search for a universal 2a charger... pretty cheap