Database Develop

Hand-cranked chargers

Has anyone used a hand-cranked charger? I have a Brookstone hand-cranked flashlight/radio that can charge phones. I'm considering getting an adapter to charge my Tilt but I don't know if it can handle it. It says it can output up to 600mA. I've heard bad reports of other chargers with dumb phones but nothing of this one. It seems unlikely this can keep a power-hungry Kaiser charged. It also outputs 6 volts. I hope this doesn't fry the phone.
Edit: I meant 600mA

Any estimates on how long it would take to reach full battery charge?
A couple of hours?
Excellent for weight loss, especially if you use 3G...

The standard Kaiser or Hermes wall charger is rated at 1A (1000mA), and a powered USB port outputs 500mA. As some people have problems charging from USB - particularly after completely discharging their batteries, then I'd think that 500mA is the minimum power required to charge.
If you install one of those programs which displays battery power you'll probably find that the power draw is much higher than 6mA (even in standby) so all you'll do with the hand cranked charger is slightly reduce the rate at which the battery is discharging.
Looking at a 1350mAh battery, this would take a minimum of 9 days and 8 hours to charge the battery from flat if it isn't being used - great workout but hardly worth it

I got a cheapo one from some gareg... AA branded thing for a fiver, flash light thingy to... five mins of winding gave a one percent increase in battery, but then if your really stuck it could be a good thing... only cost a fiver too!

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.
Click to expand...
Click to collapse
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.
Click to expand...
Click to collapse
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.

1200 mA charger; will it smoke ?

Question: What happens if I connect a Nokia AC-10 Micro-USB charger, that has an output of 5V, 1200 mA, into the phone ? I'm asking this because inside the phone, on the back of it, where the battery compartment is, it says maximum of 1000 mA.
So what would happen if I would connect the charger ? Would it end up in smoke ?

lambda30 said:
Question: What happens if I connect a Nokia AC-10 Micro-USB charger, that has an output of 5V, 1200 mA, into the phone ? I'm asking this because inside the phone, on the back of it, where the battery compartment is, it says maximum of 1000 mA.
So what would happen if I would connect the charger ? Would it end up in smoke ?
Click to expand...
Click to collapse
It depends on what the voltage rating for the phone is, if it is 5v, i believe it should be ok, you may find it actually charges slightly faster, if the voltage is higher thats when you can cause damage though.
I am not 100% sure on this maybe someone else can confirm

Phone: 3.7 V, 1000 mA
Battery: 3.7 V, 1500 mAh
Original Nexus S Charger: 5 V, 700 mA
Nokia AC-10 charger: 5 V, 1200 mA
Charge time = battery mAh / charger mA = 1500 / 1200 = 1.25 h = 75 mins
So the NS battery should charge in 75 mins with the Nokia AC-10 charger.
So all the chargers are 5 V rated, ranging from 500 mA (USB cable) to 1200 mA this Nokia charger. For example, with the HTC Desire, I had an 1000 mA charger that worked flawlessly.
LE: Never mind, I found the response. Sorry for making another thread on this matter, but I didn't find the other topic when I first searched the threads. http://forum.xda-developers.com/showthread.php?t=897935
If a mod sees this thread, please, do delete it, because it's useless now. Thanks a lot anyway !

Just on a side note: Your phone will not necessarily charge faster just because your wall charger can supply more current.
It depends on the charging circuit inside your phone, too. If your Nokia charger and the Nexus S conform to the USB charging specification, the phone will know how much current the charger can supply by the resistance between data+ and data- on the USB-plug. But how much current it draws is up to the phone.
Also, charging LiIon batteries is not as straight forward as (battery mAh)/(charger mA).
It will (most likely) be charged constant current at first and later switched to constant voltage top off charge. I read somewhere that the faster you charge at the beginning, the longer the top off will take.
So you will only gain time, if the supplied wall charger was too weak anyway and why should Samsung do that?
In any case, if you want to try anything you should be sure to be inside USB specs. I think it is 5V +- 5%, so from 4,75V to 5,25V. Less should not be a problem, but (much) more can and will fry your phone.

Good to know, thanks a lot ! Maybe I'll come back here with a comparison between stock charger and the Nokia one (in a couple of days).

most definitely not
i'm using a 2Amp car charger, and it charges really fast, even when the phone is ON, full brightness, gps + streaming BT to car audio
lambda30 said:
Question: What happens if I connect a Nokia AC-10 Micro-USB charger, that has an output of 5V, 1200 mA, into the phone ? I'm asking this because inside the phone, on the back of it, where the battery compartment is, it says maximum of 1000 mA.
So what would happen if I would connect the charger ? Would it end up in smoke ?
Click to expand...
Click to collapse

i would think that it would charge faster with your nokia charger but your phone will get hotter than normal. i experience this when i use my 1A charger. 1.2A will make it even warmer. i hope you dont overheat your phone.
ps. fast chargers (15 min chargers) for Ni-Mh batteries have 7.5A. those kind of chargers come with fans on them to cool the batteries while charging because it gets really hot.

Ok guys, thanks a lot, I'll keep in mind all you said. Unfortunately, I've come across a dead Nokia AC-10 charger (don't ask, lol), so I will need to get another one tomorrow. After that I'll compare the 2.

The charging circuit (in the fone) tries to stop the battery blowing up and overheating by pulsing the charge until the battery reaches 70%+ when it drops off and the charge creeps up to 97% (all values approx) when the carge circuit switches off and we are left with a fone at 97%+ (other threads on this topic itself !)
I experimented with standard Nexus AC (700mA) and USB Wall Charger (1000 mAH) and Laptop USB Cable (500 mA) and 1 am disappointed at not being able to get a FAST charge in the thing. Here is a plot of the AC Charge (700 mA charger). It never gets used a full power !
http://www.lacbayvilla.com/images/chargingfromAC.png

Ok... something is really screwed up... when I connect the phone via the Nokia charger, the touchscreen goes haywire... If I touch it in one spot, it sees the touch in another spot... It even starts apps without me even touching them... weird. Is it too powerful for the phone, or what ?

The nokia charger might not be isolated enough from mains. Too much ripple or whatever. It is unlikely IMHO, that it supplies too much current, since it is no current source, but a voltage source.

in case any one wants to know
2 Amps (2000 mAh) Blackberry charger
this is exactly the one i purchased from them http://www.dealextreme.com/p/design...lackberry-9800-9700-8900-8520-dc-10-30v-57622
been using it for over a year now, since i had my old BB and SGS i9000 and kept using the same one for SNS
i use it on a daily basis, as the first thing i do when i get on the car is to plug the charger and put the phone on winshield

Interesting enough, another one from the store has the same effect. Also, on my girlfriend's HTC Wildfire it has the same effect. Guess Nokia sucks as this as well. GG Nokia, keep it like this and you'll eventually fall like the rest of them...

I have noticed too that when the fone is on charge, the screen sensitivity is maxed out and phantom touches can occur all over the place. So much so that I unplug the charger to send sms as I can't type well enough for the spill chucker to guess what language I am using let alone what the word might be !
Anyone found the cause of this annoyance ?

lambda30 said:
Ok... something is really screwed up... when I connect the phone via the Nokia charger, the touchscreen goes haywire... If I touch it in one spot, it sees the touch in another spot... It even starts apps without me even touching them... weird. Is it too powerful for the phone, or what ?
Click to expand...
Click to collapse
The voltage is not current.
It used to happen on my desire when i bought a 99 cents micro USB charger.
By the way i ordered a AC 10 E yesterday so i am a bit worried now.

What the hell did you bump this old ass thread for? So that you can post in the dev thread?

lambda30 said:
Ok... something is really screwed up... when I connect the phone via the Nokia charger, the touchscreen goes haywire... If I touch it in one spot, it sees the touch in another spot... It even starts apps without me even touching them... weird. Is it too powerful for the phone, or what ?
Click to expand...
Click to collapse
I encountered the same situation like you, and I know many people do. I was told by my cell phone supplier that it's all due to the unstable current, which causes magnetic field to influence the scree. Or something like that. My phone even typed words or made calls by itself when charging, I can hardly control it until I stop using the charger. When I connect it to PC with USB cable to get charged or use another charger, everything goes well. So I suggest you stop using the charger on your phone. It might cause damage to it.

Charged mine with a nexus 7 charger, which had at least 2 Amps... Worked fine for me...
Sent from my Nexus S using xda app-developers app

I use 2000 to and i dont have problems.

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.
Click to expand...
Click to collapse

rockky said:
Why do you hate having your phone attached to a Cord overnight. I heard that's fine and do it every night.!
Click to expand...
Click to collapse
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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Click to collapse
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
Click to expand...
Click to collapse
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
Click to expand...
Click to collapse
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.
Click to expand...
Click to collapse
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?
Click to expand...
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

[Q] Quick Charge 2.0

So yesterday I bought a 2.0 charger off of amazon with the choe brand name. According to the ad it works with nearly every android phone, including the HTC one m8. For the past year I have been using a charger from my last phone which was a crappy flip phone and thought nothing of it, but I am wondering does this charger truly work?? According to app "Ampere" it is much slower. Also, I've read reports about phones heating up and that's what mine did last night, is that normal? How long should it take for me to full charge my HTC one m8?

It will heat up, that is normal. It'll use most of its 2.4A between 20 and 70% and then slow down. Your total charge time shouldn't take more than 1 hour, and make sure you're using the supplied cable.

Thanks for the response! So if it doesn't charge 1 to 100 in 1 hour than is something wrong? Also will a charger like this have any effect on how long my battery lasts? My last charger for whatever reason was for my last flip phone believe it or not, I never bought a new one.

Black_magic100 said:
Thanks for the response! So if it doesn't charge 1 to 100 in 1 hour than is something wrong? Also will a charger like this have any effect on how long my battery lasts? My last charger for whatever reason was for my last flip phone believe it or not, I never bought a new one.
Click to expand...
Click to collapse
no I wouldn't say that.
my 2.0 QC will get it done in about 1-2 hours compared to the 3-5 or so it took with stock charger.

0-100% will take more than an hour. I've timed mine a few times from 0-100%, not using the phone at all and in airplane mode waking it up every 5 minutes to check percentage, volts, and charge rate using Gsam batt monitor.
Comparing the two chargers (OEM HTC QC 2.0, and original HTC charger- which I believe is QC 1.0) the QC 2.0 is definitely faster. Even though there is nothing on the phone telling you it is using the higher wattage charging mode, it is. So, 0 to 100% using HTC's QC2, usually takes around 1:20 minutes if I remember right. As in the other post, it starts out rather slow to around 20%, then kicks in to high gear until around 80%, then slows back down all the way to 100% so as to not overcharge the battery and harm it. It really is amazing the speed that it charges at. It does get rather warm, which is normal, but shouldn't hurt the phone.
Now, completely draining and recharging these batteries frequently is not good for them and will decrease the useful life sooner. Keeping it somewhere around 80 % is ideal but realistically not practical and the manufacturers know that. That's why they build in overcharge circuitry protection so leaving the charger on all the time "shouldn't" harm the battery. Draining it down to zero and doing a full recharge cycle on it frequently WILL decrease the lifespan. The batterie's useful life is basically determined by a finite number of charge cycles.
There's tons of info on charging and batteries out there if you are looking for more reading too.

Anyone heard of the brand Auzen? It's popping up alot on aliexpress and around asian market. Not too much reviews yet on that brand.

don't play with quick chargers .I bloated my m8 batt once trying it .it charge at 2.4a .our device max is 1.5a.
If you insist using it then don't full charge with it n monitor closely .

That's impressive, I use a QC2.0 car charger, I use a variety of wall chargers that run from 1.0A to 2.3A at 5V.
So far, my battery is still very happy.
Sounds like you got a cheap knock off charger or your battery/charging circuitry was damaged/faulty and/or your ROM/firmware weren't proper, for that kind of damage to occur.

I don't think Ampere works. I once did a test (last month) and had 6 different USB cables and I wanted to see which was the best, every time I used one I got a different reading, from 200 up to 1600. Even using my Anker Quick Charge 2.0 I only got 400 so it stated.

I have been using Aukey QuickCharge 2.0 and gives pretty decent charge times.

I have a QUICK Changer 2.0. works great.. have some tips...
You know there is some colors on cable conectors ends you have to choose the right one..
- If the cable is not a quality one can result to slow charging.
Black ----- 1.0. most in stock phones
White------ 2.0. the right for fast charging...
The time on reaching 100% on battery,well Quickly charger 2.0 will reach 80% on your battery fast and it will change the next 20% slower...
There is some app in playstore can help can see the amperage live in mA..
Connect your charger to get the battery charging current or disconnect it and get the negative discharging current... and you can see your battery charging current mA is constantly changing because even on charging phone still using current (negative discharging current) and this is always changing.
On my case I see higher mA reading only under really low battery...

I have a problem with my m8 and aukey 2.0 quick charger....
After firmware update to 6.12.xxx.xxx mm , the app ampere tell me max 1600ma before update its tell 2000ma .. Its a bug or a feature of the new firmware base...??? I have cyanogenmod 13

Im using the same aukey 2.0 quick charger. Works perfect.

M8 is 1.5a max .if you use 2.0a logically you're overcharging it. Just wait for it to get bloat n replace the whole bat. worth it ?

Hi, i just wanted to say something. After many bad chargers i bought, i found the Nillkin chargers (2Amps)and Nillkin cables (2.1Amp) the best and best quality. I am always testing with good Usb voltage tester and it can charge up to 1.5 amps max on M8 and on LG G3 1.8 Amps. As long as the charger is 5.0V, amps can variate and it doesnt hurt your battery, it just charges slower or faster. In my case its charging 1% per minute on both phones. It doesn't matter if the cable is black, white, green... cables must be thick, around 18AWG that support high ampers which mean faster charging. thin cables are sh!#. And for car i also found the Scosche dual charger great for every device with Nillkin 30cm cables and Kenu airframe holder.
You can use 2.4A chargers on M8 without problem as it will only receive 1.5amps.
GL

I'm using Anker PowerPort 1+. It's very good and you can use for iPhone iPad & almost Android devices.
I bought it here: http://www.amazon.com/Anker-Charger-PowerPort-Samsung-Wireless/dp/B014F3D8FQ

henryrk said:
M8 is 1.5a max .if you use 2.0a logically you're overcharging it.
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That logic is incorrect. The phone will only draw as many amps as its rated for (1.5 amps) regardless of what the charger is rated to supply. Think of the charger amp rating as the "maximum it can supply" instead of "what it will always supply".

henryrk said:
M8 is 1.5a max .if you use 2.0a logically you're overcharging it. Just wait for it to get bloat n replace the whole bat. worth it ?
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Click to collapse
Ampere shows max charge rate for me at 2000ma. Where do you get the idea it will overcharge?