As we know S3 takes a lot of time to charge so i was curious about any tweak which can help in this thing. Any solution guys
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ashisharia said:
As we know S3 takes a lot of time to charge so i was curious about any tweak which can help in this thing. Any solution guys
Sent from my GT-I9300 using xda premium
Click to expand...
Click to collapse
There are kernels (like the Googy-Max Kernel) which can increase the standard value of 1000 mA up to 1500mA but this can reduce the lifetime of the battery or cause other unforeseeable damage to your phone. Also increasing the charging current could be useless because if you use the standard Samsung charger it's likely that it charges with a max of 1000 mA ( look at the output on your wall charger).
The only thing useful for me is to increase the USB charging current from 475 mA (which is the standard value) to 900 mA. This increases the charging speed when charging through USB noticeably.
Replace your cables with stock Samsung cables. Mine takes about 2 hours to charge fully, from the wall, no amperage modifications.
http://www.ebay.co.uk/itm/251266037573?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
I had a slow charge problem using any non-stock cable. I replaced all the ones in the house (my GF, my stepsons S2 and mine) and we were all back to good charging speeds.
hi
ashisharia said:
As we know S3 takes a lot of time to charge so i was curious about any tweak which can help in this thing. Any solution guys
Sent from my GT-I9300 using xda premium
Click to expand...
Click to collapse
Just change yr stock wall charger to Dexim brand I recommend...but not the the cable
how much does it take? around 2 hours? that is okay! if it's more, you just change the cable first. :thumbup:
SRIRAM
Sent from GT-I9300 running SOTMAX ULTIMATE V22 (XXUFME7)
mines takes around 1 1/2 hrs to fully charge I slighty bumped the mA to 1200 from 1000 mA using boeffla kernel.
I'm also using the stock charger and the standard micro-usb cable from the box.
ashisharia said:
As we know S3 takes a lot of time to charge so i was curious about any tweak which can help in this thing. Any solution guys
Sent from my GT-I9300 using xda premium
Click to expand...
Click to collapse
1. The bigger the recharging current -> the shorter the life expectancy of the battery.
2. The bigger the recharging current -> the higher the chance for the battery to become very warm and eventually burst into flames if it is a slightly defective one.
I leave mine all the night and only charge to 72% :/ but the battery was completly dead. Right now I finally fully charge my s3 (like4 hours more) When my phone was new, that happen 1 time, but I fully charge and the problem was gone. I hope that is no a phone problem.
Cables
Also ensure you're using quality cables. I had a cheapo 1-m USB extension bought at eBay that limited me to ~550 mA*; got a longer 2-m extension from "Cables to Go" (Amazon) and I'm getting ~1500 mA.
* According to "Battery Monitor Widget".
Related
My RAZR doesn't charge faster even I used with higher current 2.1 amp charger.
Is there anyway to remove that charging current limitation?
Thanks!
Sent from my XT910 using xda app-developers app
Yeah
By charging the battery directly with a charger.
Don't do that, it's dangerous (possibly) and most likely will damage the battery by charging it too fast.
And higher amperage does charge my razr faster up to ~95%
After that it charges slower, by the time it's at 100 it's like only 10mins
But from 0-90 its about a 30min gain
Sent from my XT910
ooohhaaahh said:
Yeah
By charging the battery directly with a charger.
Don't do that, it's dangerous (possibly) and most likely will damage the battery by charging it too fast.
And higher amperage does charge my razr faster up to ~95%
After that it charges slower, by the time it's at 100 it's like only 10mins
But from 0-90 its about a 30min gain
Sent from my XT910
Click to expand...
Click to collapse
0-90 : about 30mins is so impressive.
What charger did you use to charge that quicker? I've tried with my car charger Kensington 2.1amp but charging time is as the same as original wall charger 800mah.
Sent from my XT910 using xda app-developers app
That's because the phones charging protection circuitry only draws the current that is required
Sent from my Nexus 7 using Tapatalk 2
Hardware or software related?
Is there anyway we can remove that restriction?
Sent from my XT910 using xda app-developers app
I know it may sound good to remove he restriction, but it's not a good idea at all.
It's hardware related (probably just some diodes/CIs) and that's the way it should stay (from safety reasons). Batteries have predetermined "life-cycles" and by charging them with a higher current than specified, will definitely cause cells to overheat and melt/ignite. Even if you pull this off once or twice, the battery will die very quickly...
More info on Wikipedia:
http://en.wikipedia.org/wiki/Lithium-ion_battery
Scroll down to safety/specifications.
katu2006 said:
I know it may sound good to remove he restriction, but it's not a good idea at all.
It's hardware related (probably just some diodes/CIs) and that's the way it should stay (from safety reasons). Batteries have predetermined "life-cycles" and by charging them with a higher current than specified, will definitely cause cells to overheat and melt/ignite. Even if you pull this off once or twice, the battery will die very quickly...
More info on Wikipedia:
http://en.wikipedia.org/wiki/Lithium-ion_battery
Scroll down to safety/specifications.
Click to expand...
Click to collapse
Thank you for your info!!!
Due to hardware restricted, it shouldn't be a problem if I use my car charger to charge it on the way, should it?
I wouldn't pull that hardware off.
Sent from my XT910 using xda app-developers app
blisslove said:
0-90 : about 30mins is so impressive.
What charger did you use to charge that quicker? I've tried with my car charger Kensington 2.1amp but charging time is as the same as original wall charger 800mah.
Sent from my XT910 using xda app-developers app
Click to expand...
Click to collapse
an iphone charger (1A)...it gets insanely hot when charging the razr and charges mostly faster than the stock charger.
i advise to not use the 2 amp charger too often and just live with the charge times, your battery will last longer that way.
does you 2.1 A charger atleast get from 0-50 faster?
maybe it's just too much of a load so it gets restricted
ooohhaaahh said:
an iphone charger (1A)...it gets insanely hot when charging the razr and charges mostly faster than the stock charger.
i advise to not use the 2 amp charger too often and just live with the charge times, your battery will last longer that way.
does you 2.1 A charger atleast get from 0-50 faster?
maybe it's just too much of a load so it gets restricted
Click to expand...
Click to collapse
This morning I charged my RAZR with my 2.1A charger. Yes, you're right, it did charge a bit quicker before 50%. So, I reckon, I shouldn't charge my RAZR with it again.
Sent from my XT910 using xda app-developers app
blisslove said:
This morning I charged my RAZR with my 2.1A charger. Yes, you're right, it did charge a bit quicker before 50%. So, I reckon, I shouldn't charge my RAZR with it again.
Sent from my XT910 using xda app-developers app
Click to expand...
Click to collapse
exactly
i'd advise against it as that is a major jump in amps
It really shouldn't make a difference, since the phone should only be pulling what it needs/can handle. Any charger 5v 1a and up should ideally take the same amount of time to charge the battery. Just because the charger can supply a higher current doesn't mean the phone will demand it.
brandogg said:
It really shouldn't make a difference, since the phone should only be pulling what it needs/can handle. Any charger 5v 1a and up should ideally take the same amount of time to charge the battery. Just because the charger can supply a higher current doesn't mean the phone will demand it.
Click to expand...
Click to collapse
I thought the same as you before but it did charge a bit quicker than normal with 2.1A . (0 to 50%).
Sent from my XT910 using xda app-developers app
brandogg said:
It really shouldn't make a difference, since the phone should only be pulling what it needs/can handle. Any charger 5v 1a and up should ideally take the same amount of time to charge the battery. Just because the charger can supply a higher current doesn't mean the phone will demand it.
Click to expand...
Click to collapse
the circuit won't let you instantly harm the battery, but we have no idea what the C rating is on the battery so it could still stress the battery more than is needed, and yes, total charge time is pretty much the same, but it gets to a higher percentage faster, and then hits a major slowdown when the charging circuitry kicks in.
my razr makes the iphone charger i have instantly heat up, no other phone/iphone does this, there is nothing wrong with the phone or charger (it's the charger i use when not home)
I'd say it's completely safe to charge any smartphone with compatible charger. Specialized IC will check voltage, current, temperature (and their delta's)and won't let you harm your battery.
If your phone charges faster from 0-90% its OK!
I've used Nokia chargers (AC-10E and AC-50E- 1.3A), also Samsung, HTC, and lots of USB ports in cars, PC's and others with my HD2, S8500, and now XT910 - it works just fine.
If somebody knows what IC Moto used in XT910, we could check what charging routine is used and estimate max charging current (I think that 2.1A charger is overkill)
EDIT: Power management chip in XT910 is Quallcomm PM8028, but no datasheet is available.
Hi guys,
My phone is on UAE official
Just updated from ics to jb using kies and the charging is taking forever like 7% per hour
While on charge if im using the phone it actually is decreasing the battery instead of charging.
Checked using the current app the charger is supplying 1amp tried various cables and chargers etc and same
Would I need to factory reset or wipe cache after an official update.
By the way on ics charge time is perfect so not hardware fault.
Any reply would be great
Cheers
Sent from my GT-I9300 using xda premium
Been said in several other threads that this can happen if the phone wasn't on 100% when upgraded - maybe it removes battery stats. Apparently after the first full slow painful charge its reverts back to normal. I guess its trickle charging so not to damage the battery. Say battery was 50% when updated - it thinks this is full charge - once you do actually fully charge it the phone then re-learns the actual full battery in stats and is ok.
Not sure if this is 100% or not though, i made sure i was fully charged when i updated last night.
All you can do is try and see if its back to normal after a long lengthy first full recharge
Yes that could be the case due to updating at around 85 percent.
Thanks for the great info
What explains the charge decreasing while on charge on use ??
Anyone ??
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Ok so I changed the original charger that has the usb input with the extension cable. This is the 1amp charger the red led looked dim using this on JB rom
Now I used the 500ma output direct wall charger with no usb input all in one charger and the red led is full bright like ICS rom and now charging while using phone and charge rates are back to normal
anyone know how to fix usb charger thinking its not AC more like charging from pc usb ??
Cheers
Sent from my GT-I9300 using xda premium
I don't know what really is happening but my phone started to charge reeeeeallly slow in the last two days. ( I got JB over the air a few days back).
It's for example charging right now and as soon as I start to use it while charging, the battery percentage goes DOWN.
I never had this before. On ICS I was able to easily get through 2 days (I mostly have power saving feature on, since everything works great even in power save mode).
What the hell is happening here.
Screenshots
https://www.dropbox.com/s/zs2je0episg0bng/2012-10-28 03.06.42.png
https://www.dropbox.com/s/sgbyag9yt54j0tm/2012-10-28 03.07.03.png
https://www.dropbox.com/s/p15xqw2oelvwb62/2012-10-28 03.08.15.png
Same here.
Sent from my GT-I9300 using xda app-developers app
I used to have this problem, too. I fixed it by turning my phone off and letting it charge to 100%. After that, it would charge and discharge as expected again.
I have the same problem,
But I have a temporally solution , I charging my mobile with my old charger for galaxy s2 ( which is direct to wall ) , it will charge fast as ICS rom before ( 1-100% 2:20 mnts)
I think there is a problem in JB rom, the mobile thinking the original charger (with extension USB cable) it is charging from computer ... so it is really really slow , plus it is not charging after 90%
any how .. the mobile charging well when it is off.!!!
This my experience
Yes like you im using direct charger 500mA and its charging while I use phone and I get full charge from 10% to 100% in about 2 hrs and 50 mins
For a second I thought I was the only one with this issue turns out many of you guys noticed this problem aswell
thanks for the all the input
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Hi all, before too charge my galaxy note 2 takes just 2 and half hours, but yesterday I changed to new charger cable that is longer and maybe the material made its now good, the phone took 5 hour to charge, now I want to know charging phone very slow is good for the battery life?
Sent from my GT-N7100 using xda premium
raidy said:
Hi all, before too charge my galaxy note 2 takes just 2 and half hours, but yesterday I changed to new charger cable that is longer and maybe the material made its now good, the phone took 5 hour to charge, now I want to know charging phone very slow is good for the battery life?
Sent from my GT-N7100 using xda premium
Click to expand...
Click to collapse
I wouldn't think that charging slow or fast would affect the battery life at all. The only concern I see when charging the battery is that you don't overheat it, and neither of these options sound like they are going to do that.
I would say that the only way your method of charging could affect battery life is if you used one of those "rapid charge stations" in airports. I would imagine fully charging your battery in 15 minutes could not be good for it.
Thanks! I am afraid about that if could affect the battery life, because I still use the phone charger I just changed the usb cable to a longer one, maybe the cable electrical conductor is not good quality as the original one.
And this can take all night to charge the battery. Time it's not problem, I just care about battery life.
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raidy said:
Hi all, before too charge my galaxy note 2 takes just 2 and half hours, but yesterday I changed to new charger cable that is longer and maybe the material made its now good, the phone took 5 hour to charge, now I want to know charging phone very slow is good for the battery life?
Sent from my GT-N7100 using xda premium
Click to expand...
Click to collapse
The material, length and quality of the USB cable has no significance what so ever for the charging times, trust me. If it's USB 3.0 or not may, though.
Please, confirm this information.
First question
How I know, Galaxy S3 uses lithium-Ion technology battery.
This batteries types should be never fully discharged, because the life of battery shortened every time doing that, right?
And need to charge them every time it's possible, without waiting it goes below 30% or less?
Unlike Ni-Cd batteries, should be totally discharged to set them at full charge cycle again.
Another question
Battery capacity (for example Galaxy's S3 - 2100mAh), should be charged with max rate charger, about 2100mA or less?
If I buy another battery with capacity ~3000mAh, can I charge it with 3000mA charger or less?
In case of USB charging is about 1000-1200mA, but USB DC power supply is 12V, instead of standart wall charger, is it safe for everyday charge?
And last question
How critical to remove charger after battery fully charged. This question not about overnight charging, i know overnight is not good for battery, but what about 1-4 hours "overcharging"?
Thank you!
also curious about this since I just got my S3...
Actually i never worried abt battery problems since whatever happens u can always buy a new battery!
the first one is correct.
the 2nd one is based on the rules that the slower the charge, the better it is for the battery (ofcourse there's a balance to this. If it's too slow, you'll never be able to fully charge your battery in time, but if it's too fast, you will damage the battery little by little). On this, you should just stick with the standard 1000mA. it'll charge it just fine. You will be just as fine using the USB charge speed of 475 mA.
3rd Li-ion have an active circuit system that handles overcharging. In fact, it switches to trickle charging (extremely slow charging) to combat that. Don't worry too much about overcharging. The active circuit will help manage that "problem"
russeini, it's not about costs (unless your usage forces to buy new battery every 6 months), but proper operation of phone. Stability is very important for me, even if i feel a little decrease of performance, i will try to fix it / buy parts.
mputtr, thanks for your reply!
Question 1: Lithium-ion batteries do not have "memory" so they do not need to be fully drained. It's actually bad for the battery to fully discharge. Simply charge when it gets low. (<25%)
Question 2: You are confusing battery capacity (mAh) with current (mA). Think of this as battery capacity is the amount of water a cup can hold, and the current is how fast you are pouring. Regardless of battery size, the internal circuitry will limit the current drawn from a given charger up to a certain point. A 2000mA charger will not charge the SGS3 any faster than a 1000mA charger. Maximum current draw for the SGS3 is somewhere between 750mA and 1000mA. What's more important than the current rating is the quality of the charger itself. A good quality OEM Samsung, HTC, Apple, Motorola, or HP USB charger works best. FYI, USB 2.0 is 500mA, USB 3.0 900mA. All USB ports only output at 5V
Last question: It won't harm your battery, the phone does not overcharge, it will stop charging once the battery is full.
Suggestion: Use a quality charger, I suggest the Samsung 1A or Apple iPhone 1A chargers, and use a high quality USB cable with preferably 24awg (lower number is better) power leads. Plug it in every night and don't worry so much about the battery. It will last at least a year and since the SGS3 luckily has a removable battery, it can easily be replaced with a new one!
Nokia 1200ma charger
Hello,
I have 2 questions I would really appreciate if someone could assist with.
It's about a new charger I got- genuine Nokia 1200ma (5V) charger :
1. When charging I checked using 'Galaxy Charging Current' app the current value that is drained,
and it showed me around 500ma, instead of 1000ma max. Why is that?
2. The touchscreen gets messed up and almost doesn't work while charging. It doesn't bothers me much, but can it harm the phone?
Thanks in advance.
- Jerry
jumbos said:
Hello,
I have 2 questions I would really appreciate if someone could assist with.
It's about a new charger I got- genuine Nokia 1200ma (5V) charger :
1. When charging I checked using 'Galaxy Charging Current' app the current value that is drained,
and it showed me around 500ma, instead of 1000ma max. Why is that?
2. The touchscreen gets messed up and almost doesn't work while charging. It doesn't bothers me much, but can it harm the phone?
Thanks in advance.
- Jerry
Click to expand...
Click to collapse
Dont use a nokia charger for samsung devices. Somewhat they are not compatible though it charges (but not at its best). I also experienced the touchscreen issues with my xperia sola, when i used another type of charger (not the stock sony). So i suppose use same brand for charging your s3.
Sent from my GT-I9300 using xda app-developers app
Why is this thread even here lol.
tsukot said:
Dont use a nokia charger for samsung devices. Somewhat they are not compatible though it charges (but not at its best). I also experienced the touchscreen issues with my xperia sola, when i used another type of charger (not the stock sony). So i suppose use same brand for charging your s3.
Sent from my GT-I9300 using xda app-developers app
Click to expand...
Click to collapse
I see. I don't have the stock charger. I only have this Nokia charger. So, you are suggesting me stop using it and go buy a new Samsung charger, right?
You think the Nokia charger may damage the phone or the battery?
jumbos said:
I see. I don't have the stock charger. I only have this Nokia charger. So, you are suggesting me stop using it and go buy a new Samsung charger, right?
You think the Nokia charger may damage the phone or the battery?
Click to expand...
Click to collapse
One don't hijack threads and two your choice re charger but use Nokia and warranty is void .
jje
JJEgan said:
One don't hijack threads and two your choice re charger but use Nokia and warranty is void .
jje
Click to expand...
Click to collapse
Thanks for help.
I don't know what is "hijack threads". I just searched google for 'charging Galaxy S3', found this thread and replied.
To save battery life, the best strategy is using the default Samsung charger voltage with a very very low intensity (some mA).
For all lithium batteries: less charging intensity is -> less battery's temperature is -> less battery damage BUT charging is very slow.
If you apply an high intensity (> 1A), the charging time is reduced but it damages the battery.
jumbos said:
Thanks for help.
I don't know what is "hijack threads". I just searched google for 'charging Galaxy S3', found this thread and replied.
Click to expand...
Click to collapse
hijack means you using someone else's thread which talks about a different topic to ask your own questions that is not about the thread.
kinda like interrupting a conversation about new cars to ask if anyone knows how to fix your motorcycle.
Sent from my GT-I9300 using xda app-developers app
mputtr said:
hijack means you using someone else's thread which talks about a different topic to ask your own questions that is not about the thread.
kinda like interrupting a conversation about new cars to ask if anyone knows how to fix your motorcycle.
Sent from my GT-I9300 using xda app-developers app
Click to expand...
Click to collapse
OK, but my question is totally related to the topic..
jumbos said:
OK, but my question is totally related to the topic..
Click to expand...
Click to collapse
only related in the concept of charging. you're having a specific issue about a specific charger.
you're technically hijacking a thread. but whatever. i eas only explaining to you what hijacking a thread means.
Sent from my GT-I9300 using xda app-developers app
mputtr said:
only related in the concept of charging. you're having a specific issue about a specific charger.
you're technically hijacking a thread. but whatever. i eas only explaining to you what hijacking a thread means.
Sent from my GT-I9300 using xda app-developers app
Click to expand...
Click to collapse
OK, thanks.
I think that you can turn off some process if you don't use it.It can save your battery !Thank you
The gs4 doesn't charge at 5.0 V and 2.0mA this new battery app proves it it only charges at 4.1v and 1mA using charger that comes with gs4
Sent from my SCH-I545 using xda app-developers app
is it possible the app is wonky or reading the phone incorrectly? mine charges up quickly and just fine. not sure how the samsung charger is fake...
gabrielpina4 said:
The gs4 doesn't charge at 5.0 V and 2.0mA this new battery app proves it it only charges at 4.1v and 1mA using charger that comes with gs4
Sent from my SCH-I545 using xda app-developers app
Click to expand...
Click to collapse
The app can only tell how much different the battery is, not how much juice is actually flowing into it. Meaning, the possibility exists that you phone is *using* juice while it's charging, lowering the amount of difference the app can see.
gabrielpina4 said:
The gs4 doesn't charge at 5.0 V and 2.0mA this new battery app proves it it only charges at 4.1v and 1mA using charger that comes with gs4
Sent from my SCH-I545 using xda app-developers app
Click to expand...
Click to collapse
Thread fail. Voltage output, as verified with a Fluke 77 Type IV multimeter, is spot on 5 VDC. Current, which is governed by the phone, has been verified by many to a max of 1900 mA.
I can see just from the screenshots that the app is detailing misinformation. Were your phone actually charging at the rate indicated, it would take approximately 26 days for it to fully charge, assuming no use, from the 76% in the screenshots.
Oftentimes you get what you pay for. Such is the case with Amazon's Free App of the Day sometimes.
najaboy said:
Thread fail. Voltage output, as verified with a Fluke 77 Type IV multimeter, is spot on 5 VDC. Current, which is governed by the phone, has been verified by many to a max of 1900 mA.
I can see just from the screenshots that the app is detailing misinformation. Were your phone actually charging at the rate indicated, it would take approximately 26 days for it to fully charge, assuming no use, from the 76% in the screenshots.
Oftentimes you get what you pay for. Such is the case with Amazon's Free App of the Day sometimes.
Click to expand...
Click to collapse
god among men
Sent from my SCH-I545 using xda premium
I know this is incorrect but even if I didn't, I still would not believe it was not 2amp. This phone charges scary fast.... so fast that I do actually use a 1amp charger. I don't hate my battery enough to charge it that fast
Sent from my rooted S4 blessed with Cleanrom 1.2
Help a newbie out.
I had an iPhone 5 that charged ridiculously fast compared to older phones.
When I'm charging my new S 4, how do I get the faster charge rate?
I'm currently using the Moto 2 USB wall outlet charger that came with my razr maxx hd. And it seems like it takes way longer then my five and I chalked it up to having twice the battery.
Is there a faster way to charge?
Sent from my SCH-I545 using xda premium
Rickinsav said:
Help a newbie out.
I had an iPhone 5 that charged ridiculously fast compared to older phones.
When I'm charging my new S 4, how do I get the faster charge rate?
I'm currently using the Moto 2 USB wall outlet charger that came with my razr maxx hd. And it seems like it takes way longer then my five and I chalked it up to having twice the battery.
Is there a faster way to charge?
Sent from my SCH-I545 using xda premium
Click to expand...
Click to collapse
Use the charger and cable that came with the phone.
Sent from my SCH-I545 using Tapatalk 4 Beta
najaboy said:
Use the charger and cable that came with the phone.
Sent from my SCH-I545 using Tapatalk 4 Beta
Click to expand...
Click to collapse
The new charger is amazingly fast, if thats a word. I was going to use my.old charger from the s3 at work but its so slow it barely keeps up with use and can't keep up if I'm running my wifi or playing games. Now I just need to find a car charger thats as fast as the new charger.
Sent from my SCH-I545 using xda app-developers app
Keep in mind there's more to it then just the wall charger's output ability. There's something in the S4 that recognizes the original sammy charger and turns up the charge rate yet will only allow a trickle charge on other non-sammy 2.1A wall chargers.
It appears that dome people are aware of this and have managed to modify the non-sammy chargers to enable the faster charge. Then there's some semantic confusion between "quick charge" and "fast charge" features that may be enabled in roms or kernels.
All I know is I wish there were more info on this stuff.
A little knowledge of how Li-ion batteries charge is an important thing. Li-ion batteries have special charging requirements.
The part you plug into the wall... thats not a charger... its a power supply. It provides a 5v DC output at up to 2 amps.
The charger is built into the phone, and it determines how to use that available power to charge and power the device.
Li-ion batteries charge in a two stage cycle that is called "constant current/constant voltage". It is also important to know that a battery's voltage drops as it is discharged. (this voltage drop is how the battery meter gets its information, as it is predictable when tested under constant loads... the variable load of a phone is why the meter seems to be inaccurate at times)
During the first phase, "constant current", the battery is fed a constant current at the same voltage as the battery is currently outputting. As the battery takes in energy, the voltage rises but the current is kept constant.
The second phase, "constant voltage" starts when the battery reaches its highest voltage. (or more accurately, its highest safe voltage, which is around 90% capacity) During this second phase, the battery is fed a constant voltage, (the max voltage) and the current varies. The battery will draw as much current as it is able, and this rate slows naturally as the battery reaches full capacity. When the current drops lower than a certain set amount, the charger stops the charging process and the battery is said to be fully charged. This second phase is slow compared to the first phase, and that is why it can seem like the last 10% of charge takes longer than any prior 10%.
Some phones use the power supply to both power the device and charge the battery, the battery is electrically isolated during charging... but most charge the battery without isolation. Either way, the power from the power supply is being used to both charge and power the device, and this limits the charging speed.
This also limits the maximum capacity the battery can be charged to while in the device, because the voltage/current measuring is less precise. Unfortunately for these phones, the charging is controlled by software, and not simple hardware circuits that are isolated from the battery power. In fact, even when charging the phone with the power off... the phone is still actually powered up but in a low power background mode. This mode is actually a special screen off recovery mode. CWM recovery has had several instances of bugs, where the phone could not charge if the battery died to the point of powering of the device. Because the phone could never power into the special mode to start charging, due to this special mode being missing from, or bugged in CWM.
Also... these batteries have on average a 2-3 year lifespan, and also limited number of recharge cycles. The 2-3 year life is the same even if the battery is unused. As the battery ages, it looses capacity.
Charging at slower rates is better for battery lifespan than higher rates. Now the batteries in the S4 and especially the Note 2 are larger, and 2A is still considered a fairly slow rate, but of course 1A is even better. If you tend to charge only at night while sleeping, it may be better to use a 1A charger.
Awesome explaination !!! That makes complete sense and explains things. The point made in a prior post, about the phone recognizing the new charger, thus charging faster makes sense as well. The new charger must "turn on " the quicker charging on the S3 as well, because it charges my old S3 as fast as my S4. I didn't try the charger on the older firmware but it definetly works with the latest update.
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