Database Develop

Do you leave your XDA charged when you are not using?

Does any one know if leave it charged is bad for the battery, or not? :?:

I read somewhere that li-ion batteries work better when charged often. It's to do with the way the batteries degrade. Mine is generally on charge more often than not and I have noticed no loss of life in nearly a year.
I do wish I could find a way to bypass that 72 hour rule though.

pug said:
I do wish I could find a way to bypass that 72 hour rule though.
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What 72 hrs rule?

The battery only drains to about 50% to allow for 72 hours main battery backup in case you are away from a charger for the weekend or something.
As I'm never away from a charging source for more than 2 hours, I want to disable this to allow extra usage at any one time.
Hope I answered your question earlier.
Pug.

From reading Li-Ion behavior over the internet, they said while Li-Ion battery provides a light weight, it is sensitive on the overcharging issue.
So, I was concern in overcharging mine.
But, perhaps the charger has a built-in mechanism to sense full charge and prevents overcharge the battery. :?
In any way, thank you for your input on charging the batter and the 72 hrs rule.

Some essential information on Li-Ion batteries:
http://www.batteryuniversity.com/partone-5.htm
http://www.batteryuniversity.com/partone-12.htm (charging Li-Ion batteries)
Contrary to popular belief, Li-Ion batteries DON'T have a memory effect like NiMh or NiCads do, you don't have to charge them for 10/12 hours when you first get them, you just give them a topup charge to make sure they're full and off you go.
Whenever I get back home, and I'm at my PC or in my room, I'll always charge my phone in. The XDA literally eats battery life, and I'm seriously debating buying one of those 2600mAh batteries to replace the supplied one, it sucks if you're using it for anything like Bluetooth and you're not using an in-car charger / you're walking around in a town or city for a fair while.

How many times you can charge a Diamond battery??

I red last week somewhere that a liion battery lifetime isabout 300 times charging, does anybody now or this is true?
Willem

http://en.wikipedia.org/wiki/Lithium-ion_battery
You can find there answer to your question..

The life span is dependent upon aging (shelf life). From time of manufacturing, regardless of whether it was charged or the number of charge/discharge cycles, the battery will decline slowly and predictably in capacity. This means an older battery will not last as long as a new battery due solely to its age, unlike other batteries. This drawback is not widely published.

Wilsas said:
I red last week somewhere that a liion battery lifetime isabout 300 times charging, does anybody now or this is true?
Willem
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i must charge my diamond 2 or 3 times a day duz that mean im gunna have to buy 3 batterys a year lol

mancsoulja said:
i must charge my diamond 2 or 3 times a day duz that mean im gunna have to buy 3 batterys a year lol
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same, my diamond is connected about the same amount of times per day, and then left on charge when im at home to ensure i have adequate battery, eek!

I think the 300 times charging is refer to 300 full complete cycle of charging. It need to be refer to complete a cycle from fully discharge to fully charge. If you charge your battery from 50% to 100%. It is only 1/2 cylce.
Anyone can correct if i'm wrong.

I think a complete discharge counts as 1. If you charge the battery now and then without letting it discharge completely it will last longer. This is quite Li-Ion specific.

In heavy usage a battery lasts for 2 years easy.

Riel said:
In heavy usage a battery lasts for 2 years easy.
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Even when you charge it 2 times a day? This should mean about 1400 charging?
Willem

Right, firstly, forget anything that has been written above. 300 is crap. (the film '300' isnt tho)
lithium ion batteries generally last longer when kept topped up, rather than cycled.
The batteries in out Diamonds are lith ion, but have been specifically designed for top up charging, therefore last longer.
you can expect your battery to last for 3 years of continuos use, unless there is a fault or it is damaged. It will slowely deteriorate over time.
I have just bought a new battery for my laptop, which is Lithium Ion, as was the original. This is after 10 years!

mugglesquop said:
... I have just bought a new battery for my laptop, which is Lithium Ion, as was the original. This is after 10 years!
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OK. I know it is out of the topic, but i still want to say: My laptop which is a precision workstation laptop's battery only last 1 year.
So, it is fair that if you discharge and charge frequently, it will deteriorate faster. This is fair enough.

Li-ion battery life - the facts
Skipping back to the facts for a moment.... the HTC Diamond standard battery is a Li ion battery with Co chemistry.
1. Li-ion batteries last between 300-500 deep cycles (from 0% to 100%).
2. Partial recharges are good. A partial recharge from ~25% to ~75% is less damaging than a recharge from 0-100%, and only counts (roughly) as around 1/4 of the impact of a deep cycle. Li ion technology has no charge memory effect, which means that the battery capacity is completely unaffected by partial charging (n.b. this is NOT the case for NiCad or NiMH technology).
3. Li-ion batteries also decay at a constant rate over time, dependent on temperature, and regardless of use. They lose around 20% capacity per year at 25C, but this is increased at higher temperatures. Shelf life is optimised by keeping unused batteries at 6C (fridge temp) and with ~40% charge. But do not freeze them!
4. 100% charge causes accelerated decay rates. So keep your battery below full charge.
5. Deep cycle the battery occasionally (~once per 30 charges), to recalibrate your charge meter. Otherwise the charge level shown will become inaccurate.
6. Key advantage for Co chemistry is high energy density - up to 200mWh/g. Key disadvantage is the charge/discharge limit, which is ~1.2 coulomb.
7. Conclusion is that you can expect your Diamond battery to last for ~3 yrs of hard daily use. If you take care of it, it will last for double that time.
More info can be found on http://www.batteryuniversity.com/parttwo-34.htm,
and at http://en.wikipedia.org/wiki/Lithium-ion_battery

[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

Buy yourself a cheaper battery: using lower amp batteries with the Nexus S

I have always thought that the amperage of a battery made no difference to the voltage due to the factory adjusting the internal resistance of the battery. Amperage I understood was measured in current, however, which does have an effect on overall voltage.
Recall:
V = I * R
With electronics, it is my understanding that the mAh battery doesn't matter as long as the voltage is the same, although you'd get less longevity out of a 1650 mAh vs a 1440 mAh.
Thus, I believe this battery would work. Thoughts? The part number matches exactly what was in my Nexus S and the batteries look identical. If this is the case, save yourself some money buy not searching Nexus S battery and instead searching ab653850ca in eBay instead of paying $30-$40 for a new/replacement Nexus S battery when they are the same thing.
http://cgi.ebay.com/NEW-OEM-SAMSUNG...Accessories&hash=item3a5dd479e2#ht_1287wt_900
Thoughts? Both are 3.7 volts.

mAh is a unit of electric charge, not current (notice the 'h' making it milli-Ampere-hour). So, yes, a lower mAh battery will definitely work, but it will last less time.
Also (just trying to explain better) a battery is not a "powered resistor", so the relationship between its voltage and its current is not just ohm's law (the one you recall). More specifically, the 3.7 volts is due to the chemical reaction inside the battery and is more or less fixed (although it decreases as the battery discharges). The current flowing is basically a function of the load of the battery, so it changes according to what parts of the phone are working at that moment. The output resistance of the battery is a formal way of describing how close the battery is to an ideal voltage source and is not related to the amount of current it's actually providing.
Sorry if I was not clear enough, it's late here!

Missed the h. Not sure why, I see mA all the time and I just missed the h. Interesting and helpful. Thanks man. Clear to me.

That's strange, if it is the same model (AB653850CA), why is it only 1440mAh? But I'm sure it will work.

All I know is that this Samsung Moment battery I got off of Amazon for $6 is almost as good as my stock battery.
Sent from my Nexus S using XDA Premium App

The 1440mAh batteries work perfect, I have 2 of them. While you are at it, buy a wall charger to charge them in so they will charge to 100%. Having 2 spares means you will always have a FULLY charged battery to pop in and never have to tether the phone to a charger. Plus you get 2 to 4 extra hours of use.

Very informative!

turbodroid said:
Plus you get 2 to 4 extra hours of use.
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What do you mean by that ? That the 1440 mAh battery only gives you 2-4 hours ? I doubt it lasts so little time. I hope it doesn't.

No he means charging the batteries in an external charger gives them a more complete charge as I find the same thing. I've got 2 genuine batteries and a third on the way and the external charger charges them to 100% whereas the phone only charges them to around 95%. The batteries charged in the external charger last longer than those charged in the phone.

Hard to know when you're legitimately getting a battery with "more capacity" though, so I just assume I'm always buying another stock battery anyways.

maltloaf said:
No he means charging the batteries in an external charger gives them a more complete charge as I find the same thing. I've got 2 genuine batteries and a third on the way and the external charger charges them to 100% whereas the phone only charges them to around 95%. The batteries charged in the external charger last longer than those charged in the phone.
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Oh, I got it, thanks !
Anyway, for 6$, I think I'm going to buy one, too. Coupled with the 2nd battery dock, it should work flawlessly.

Hey guys,
I went ahead and ordered one of these too. I noticed that the Watts/hour is 5.55 on the Nexus S battery but on the battery I ordered (but have yet to get in) it says 5.3. Is this going to make a difference outside of how long the battery lasts?
If you guys buy one of these 1440s report back with what you've found out.
And if this is a success, then please urge XDA to sticky this thread or put this on the main page. Paying $50 for a second/replacement Nexus S battery is outrageous, and if this saves my fellow XDA members $45, more people should know about this. :]
UPDATE:
Looks like turbodroid already ordered these and said they work great! Thanks guys! Thank me if this was helpful.

The worst thing about nexus phones thats never reported.

Okay I have a nexus S and the single most annoying thing about it is the time it takes to charge. It takes 2.5 hours to charge a 1500mah battery whereas this xperia arc S with the same battery capacity charges completely in less than an hour using the exact same charger on both phones. So obviously the nexus S has some cost cutting that it charges so slowly and yet it was never mentioned in any of the reviews.
Now at first I was ok with it but I got to use the arc S for a few days. Its like it changes everything when the phone charges in one third the time, you could care less if you get 30 min less screen on time or whatever. I just go charge the phone while going for a shower and bam its fully charged when I come back.
So upon investigation it seems like an issue with samsung phones. The galaxy S, galaxy S2 and galaxy nexus all take ridiculous amount of time to charge. So why is this never reported? Higher screen on time is no good if the charging time is so bad. My nexus S can go days without a full charge and really the only way to do it is over night.
Anyways this is LG nexus now so I was hopeful this problem wont be there. I checked out a friends optimus 2X and I was happy to see that just like the xperia it also charges in under an hour. However anandtech review says it takes 3 hours to charge and so does another user in the Q&A forum. So why on earth is not anyone complaining about it? Everyone is after the screen on time but you realize this is an even bigger issue?
And btw the iphone charges very quickly as well. And yes I realise that the nexus 4 has a 2100mah battery but it really doesnt justify the time it takes. This is almost a deal breaker for me. *sobs*

When I got my S2, I was disappointed with the charging time. But many custom kernals support fast charging by increasing the voltage level going to the charge circuit. With a tweak, my phone charged up in about 90 minutes.
But over time, you learn that the higher voltage has a detrimental effect on the total charge the battery will accept. In other words, when charging at a slower pace (lower voltage) the battery will actually absorb a higher density charge - making your battery last longer. After discovering this, I turned down the charge voltage on my S2 in favor of getting better battery life.
So I would avoid comparing the charge times with other phones. They may charge faster, but that's done by increasing the charge voltage, thus reducing battery capacity.
I have no reason to believe the increased voltage alters the total life of the battery, it just seems to affect the amount of energy the battery will absorb on a single charge.
tl;dr; The faster the battery charges, the shorter the battery life. I learned that from Upstairs Hollywood Battery School.

Seriously? Morning about charging time? GTFO!
Sent from my EndeavorU using xda premium

This isn't really a problem, it's just the way it is with all phones that use a large battery (ie. virtually all high end smartphones). The chargers are all 1A, so with a huge battery it will take ages to charge.
Efficiency is the bigger issue. The iPhone 4S/5 are pretty much the only phones to date that I've been able to charge at a decent pace off my computer's USB ports. I definitely need to buy more chargers and cables for my Nexus 4 but that's no big deal.

Dr Zoidberg said:
When I got my S2, I was disappointed with the charging time. But many custom kernals support fast charging by increasing the voltage level going to the charge circuit. With a tweak, my phone charged up in about 90 minutes.
But over time, you learn that the higher voltage has a detrimental effect on the total charge the battery will accept. In other words, when charging at a slower pace (lower voltage) the battery will actually absorb a higher density charge - making your battery last longer. After discovering this, I turned down the charge voltage on my S2 in favor of getting better battery life.
So I would avoid comparing the charge times with other phones. They may charge faster, but that's done by increasing the charge voltage, thus reducing battery capacity.
I have no reason to believe the increased voltage afters the total life of the battery, it just seems to affect the amount of energy the battery will absorb on a single charge.
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Its not a big deal as I said I have used an xperia arc S and I was satisfied with battery life, I cant imagine the xperia would have had much better battery life out of its 1500mah unit even if it was slow charging.
I mean unless we can observe what happens to the battery life of a fast charging phone by slowing its speed, we cant really conclude this since after all it was a "mod" applied on the S2.

twistedh said:
Seriously? Morning about charging time? GTFO!
Sent from my EndeavorU using xda premium
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Nobody asked you to post in the thread, charging time is a big deal its silly to think otherwise.

lambomanx1 said:
This isn't really a problem, it's just the way it is with all phones that use a large battery (ie. virtually all high end smartphones). The chargers are all 1A, so with a huge battery it will take ages to charge.
Efficiency is the bigger issue. The iPhone 4S/5 are pretty much the only phones to date that I've been able to charge at a decent pace off my computer's USB ports. I definitely need to buy more chargers and cables for my Nexus 4 but that's no big deal.
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This isnt true the HTC one X and sony xperia S charge very quickly and they have relatively big batteries.

Seriously, there's a big difference between a 1500mah battery and a 2100mah. Being that this is a lithium polymer battery it should charge a little faster. Also, like the above poster stated, slower charge is a higher density charge and better for battery longevity. I think if Samsung wanted faster charging they would have it. There is no physical barrier.

You guys know the faster your battery charges, the shorter the lifespan of the battery?
Head over to battery university
Sent from my Nexus 7 using xda app-developers app

Jayrod1980 said:
Seriously, there's a big difference between a 1500mah battery and a 2100mah. Being that this is a lithium polymer battery it should charge a little faster. Also, like the above poster stated, slower charge is a higher density charge and better for battery longevity. I think if Samsung wanted faster charging they would have it. There is no physical barrier.
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Its like 40% difference?
And isnt the nexus 4 hmm not having the best battery life despite such slow charging so I dont really feel it makes a big difference.
And btw sometimes it is a hardware limitation, nobody has been able to charge a nexus S faster not with kernels or other chargers.

tylerwatt12 said:
You guys know the faster your battery charges, the shorter the lifespan of the battery?
Head over to battery university
Sent from my Nexus 7 using xda app-developers app
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Yes, I know that. See post #2 in this thread.
I will edit my post to add a tl;dr

tylerwatt12 said:
You guys know the faster your battery charges, the shorter the lifespan of the battery?
Head over to battery university
Sent from my Nexus 7 using xda app-developers app
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It doesnt seem like a big deal, the iphone has had fast charging since the first one and its battery lasts just fine. Ofcourse one day you will have to change it but why suffer for a year just because of it?

Another one of these threads... Oh brother.
sent via xda premium with nexus 7

I always wondered why the iPhone charged so much faster than any android phone I owned

I'm saying there's no technological barrier to the Nexus S charging faster. Samsung just made it that way. Could also be because it uses a Lithium Ion battery and not a lithium polymer battery. Depending the technology, li-po batteries can charge much faster safely because they don't have the same thermal limits as lithium ion and have much less chance of exploding or catching fire. Apple some years back boasted that they had new battery tech that would allow their batteries to charge faster. If you do some internet reading on lithium polymer batteries, there are some that have characteristics to do this. As far as I know, the iphone was made after they acquired this technology and have been using it in their mac books for years, as well as the iphone.
To me it's not a huge deal, but it is less convenient than if it were able to charge faster.

Jayrod1980 said:
I'm saying there's no technological barrier to the Nexus S charging faster. Samsung just made it that way. Could also be because it uses a Lithium Ion battery and not a lithium polymer battery. Depending the technology, li-po batteries can charge much faster safely because they don't have the same thermal limits as lithium ion and have much less chance of exploding or catching fire. Apple some years back boasted that they had new battery tech that would allow their batteries to charge faster. If you do some internet reading on lithium polymer batteries, there are some that have characteristics to do this. As far as I know, the iphone was made after they acquired this technology and have been using it in their mac books for years, as well as the iphone.
To me it's not a huge deal, but it is less convenient than if it were able to charge faster.
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Well I am fine with the nexus S its something I have come to live with however I dont want this thing to be the case in my next phone.
Microsoft boasted how quickly the surface RT charges due to some new technology. Really it does matter, I suppose good for those who dont really care about it.

ctowne said:
I always wondered why the iPhone charged so much faster than any android phone I owned
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I have tested 2 android phones that charge just as fast.
Xperia arc S and LG optimus 2X.

Takes me like 2hrs to fully charge my Nexus 4.
Sent from my Nexus 4 using Tapatalk 2

Gambler_3 said:
I have tested 2 android phones that charge just as fast.
Xperia arc S and LG optimus 2X.
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That's weird because I had a G2x and that charged slower than the iPhone I had at the same time

There is clearly a link between the temperature of the battery and the charging current in the thermal management of the device :
bat_temp(C) cpu(MHz) gpu(MHz) LCD index of predefined charging current
36 1512 400 248(400nit) 0 (900mA)
37 1296 325 228(360nit) 0 (900mA)
38 1296 325 208(325nit) 0 (900mA)
39 1188 200 195(300nit) 1 (700mA)
41 1188 200 195(300nit) 1 (700mA)
42 1188 200 195(300nit) 2 (600mA)
45 1188 200 195(300nit) 3 (400mA)