Database Users

Why does it take so long to charge?

I just have one question. Why does it take so long to charge from 10% to full? It takes my incredible about 2 hours and 15 minutes to charge, my moto droid 1 hour.

Wrong Thread
Doesn't belong in the Dev. thread. As for your question.... your comparing apples to oranges. Mine takes about as long... so I don't think it's you. Probably the way the phone was designed.

dreamersipaq said:
Doesn't belong in the Dev. thread. As for your question.... your comparing apples to oranges. Mine takes about as long... so I don't think it's you. Probably the way the phone was designed.
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agreed on both points, 2 hours seems pretty reasonable to charge IMO

Yeah
br125 said:
agreed on both points, 2 hours seems pretty reasonable to charge IMO
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Click to collapse
People forget that back in the day it used to take 4 - 6 hours to charge your device, and it'd drain after about 3..... spoiled brats! LOL

Sorry I didnt mean to put the thread in the wrong place but this section seems more tech than others. Yea I figured it wasn't just my phone, I just wondering why HTC phones took longer to charge. Thanks for the help

The way Li-Ion batters are charged is not as simple as alkaline or NiMH - cell balancing, over voltage, under voltage, temp, authentication, etc.
You wouldn't want this to happen: http://www.youtube.com/watch?v=QJCZ4ayioCU

sounds like you are the type of guy who would complain about having to put premium fuel in his ferrari. one droid and inc are 2 totally different pieces of hardware. if you had reliable data to support a claim like htc phones take longer to charge then i might believe it, but u dont so dont make that claim. i have a blackberry storm (business phone) and inc (personal) i literally almost never use the BB and if i do its for calls lasting less than 10 mins. Yea it charges faster than my inc and yea the battery lasts longer, but i do way more on the inc and that takes battery and charge away. when i used the BB for everything before i got the inc, it was the same situation. so does that mean bb take a long time to charge or the battery sucks? no

UGH...
socalracer said:
sounds like you are the type of guy who would complain about having to put premium fuel in his ferrari. one droid and inc are 2 totally different pieces of hardware. if you had reliable data to support a claim like htc phones take longer to charge then i might believe it, but u dont so dont make that claim. i have a blackberry storm (business phone) and inc (personal) i literally almost never use the BB and if i do its for calls lasting less than 10 mins. Yea it charges faster than my inc and yea the battery lasts longer, but i do way more on the inc and that takes battery and charge away. when i used the BB for everything before i got the inc, it was the same situation. so does that mean bb take a long time to charge or the battery sucks? no
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Was that necessary? Yes he asked a question in the wrong forum, yes it was a poorly worded/thought out question but seriously? Just made yourself look like a big douche...
Just sayin'
The way you use the phone has nothing to do with how long it takes to charge. Could be different voltages for the two phones. The lower the voltage, usually the longer it takes to charge. You'd have to look at your adapters and see what the output voltage is on the Inc. vs Moto. Might answer your questions. Otherwise, it's probably how the trickle charge works differently on the two phones....
**DO NOT USE A HIGHER VOLTAGE CHARGER** !!!!

Also if you have a TON of stuff running on your phone, it could be a lot less "idle" than you think while it's charging.
I think the trick is to charge your phone at the perfect times - like while you are driving to work (especially if it's a long drive) or while asleep. Who cares how long it takes while you are asleep??

Droppin' some science!
This is just technical information for anyone that may be interested, I don't know if it will exactly "help", but it should answer the question of the post (also please keep in mind that these are two phones from two different manufacturers so even if they are running the same OS, the way they manage and consume power would be different regardless).
Motorola Droid (Stock)
Lithium-Ion Battery
1400 mAh
3.7 volts (Output)
HTC Incredible (Stock)
Lithium-Ion Battery
1300 mAh
4.2 volts (Output)
For tips on improving the battery life of an Incredible, there is a highly detailed forum post at AndroidForums.com

i wish my incredible would charge in 2 hours at 10%. My DI takes 4 hours to charge. very sad

moosc said:
i wish my incredible would charge in 2 hours at 10%. My DI takes 4 hours to charge. very sad
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Using the stock wall charger?? Don't think mine's ever taken 4 hours

Yep use the stock wall charger and data cable.
-------------------------------------
Sent via the XDA App

moosc said:
Yep use the stock wall charger and data cable.
-------------------------------------
Sent via the XDA App
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You don't want to charge with the data cable. It's intended to only maintain battery life when tethered, not charge it.

aibrean said:
You don't want to charge with the data cable. It's intended to only maintain battery life when tethered, not charge it.
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well its the cable that comes in the box.

aibrean said:
You don't want to charge with the data cable. It's intended to only maintain battery life when tethered, not charge it.
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Huh?
The data cable is what comes in the box with the AC head (which has no cable but a USB connector).
I use the same data cable connected to a number of different computers, notebooks and netbook and charge all the time.
When connected to a computer, it is slower to charge, but it charges just fine.

krelvinaz said:
Huh?
The data cable is what comes in the box with the AC head (which has no cable but a USB connector).
I use the same data cable connected to a number of different computers, notebooks and netbook and charge all the time.
When connected to a computer, it is slower to charge, but it charges just fine.
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I think he means that he's using the cable with the AC head, and it takes 4 hours (as in, he's not using some off-brand charger from Radioshack, or something like that).

My DI definitely takes longer than 2 hours as well, Not sure the exact %'s, but at home today had it plugged in from when I woke up until I left for work (about 2 hours) and it seemed like it went roughly from 10% to 80% only.

dreamersipaq said:
Was that necessary? Yes he asked a question in the wrong forum, yes it was a poorly worded/thought out question but seriously? Just made yourself look like a big douche...
**DO NOT USE A HIGHER VOLTAGE CHARGER** !!!!
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All kinds of misinformation on this thread. Any charger that complies with USB standards is going to be 5V, no more no less, whether it has a microUSB tail on it, no tail, or a rat tail.
aibrean said:
You don't want to charge with the data cable. It's intended to only maintain battery life when tethered, not charge it.
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krelvinaz said:
Huh?When connected to a computer, it is slower to charge, but it charges just fine.
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Exactly. PC/LAptop USB power is just as good as wall-power, it's just a lower amperage, something like 500mA to the AC head's 1A/1000mA. More amps means faster charge.
I believe our DI batteries are 3-cell, judging by the four terminals on the battery: 1 (+)power, 2 (+)power, 3 (+)power, 4 (-)common ground. I don't know what sort of battery the Moto Droid has but it's a motorola, so it's gonna fail soon anyway (sorry, I'm just sayin). I know the G1/Dream battery was 3-terminal, and when some went to a Seidio 2600mAh extended battery (twice as many cells), they had to charge it 8 hours when they first got it.
Obviously, turning the phone off to reduce the load on the battery, using the wall charger, and making sure you're not short-charging all the time will reduce charge times overall. Judging by the battery life I've gotten so far and what a monster this phone is compared to my G1s, I'm more than happy to wait an extra hour with the phone off, that's what Google Voice is for

Using Nexus 7 charger to charge mobile phones?

Hi,
Nexus 7 charger ouputs 2A.
Is it safe and ok to use it to charge Galaxy Nexus, Nexus S, and HTC Desire?
I am thinking more in the long run, if it does not brake the phones.
Thanks

It should not hurt anything.My daughter charges her Droid 4 with my charger every day.

It'll charge it really slow since phone chargers are 1A. Everyone will have their opinion on this but my opinion is I wouldn't use a phone charger on the N7....it could over heat due to it charging slow. But I'm sure you'll hear others saying a slow charge is better so....
Sent from my Nexus 7 using xda premium

dirtyhamster73 said:
It'll charge it really slow since phone chargers are 1A. Everyone will have their opinion on this but my opinion is I wouldn't use a phone charger on the N7....it could over heat due to it charging slow. But I'm sure you'll hear others saying a slow charge is better so....
Sent from my Nexus 7 using xda premium
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I was asking the other way around.
To use Nexus 7 to charge my phones. But the previous user just answered, thanks James.
When traveling, I want to carry just one charger for all my devices.
Sent from my Galaxy Nexus using xda premium

gogol said:
Hi,
Nexus 7 charger ouputs 2A.
Is it safe and ok to use it to charge Galaxy Nexus, Nexus S, and HTC Desire?
I am thinking more in the long run, if it does not brake the phones.
Thanks
Click to expand...
Click to collapse
Yup, it's fine, because a standard charger is, or used to be, 500 mAh, at 5 volts.
Some chargers are more mAh, like 700, and some are even 1 A.
If a charger is 2A, and your phone only draws 500 mAh, that is perfectly fine, because it's only drawing a quarter of what the charger can produce. In this case, the charger probably won't even get warm.

Neither my Sensation nor my wife's Sensation XL has died yet from using the Nexus charger
What mvmacd says is correct - just because the charger can supply 2A, it is the device that decides how much current it draws from the charger.

dirtyhamster73 said:
It'll charge it really slow since phone chargers are 1A. Everyone will have their opinion on this but my opinion is I wouldn't use a phone charger on the N7....it could over heat due to it charging slow. But I'm sure you'll hear others saying a slow charge is better so....
Sent from my Nexus 7 using xda premium
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Click to collapse
I actually find the charger that came with my razr does the job fine and its rated at 850ma. Other lower power chargers i have are slow though.
I doubt a slow charge would lead to overheating or else connecting to a pc would cause this too.
I think for chargers its a case of trying them to see how well they work.
Sent from my Nexus 7 using Tapatalk 2

gbroon said:
I actually find the charger that came with my razr does the job fine and its rated at 850ma. Other lower power chargers i have are slow though.
I doubt a slow charge would lead to overheating or else connecting to a pc would cause this too.
I think for chargers its a case of trying them to see how well they work.
Sent from my Nexus 7 using Tapatalk 2
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Science proves other than your opinion. A too-low or too high max voltage or amperage charger can and will lead to overheating and severe reduction on battery life and can destroy the adapter as well.

MrSchroeder said:
Science proves other than your opinion. A too-low or too high max voltage or amperage charger can and will lead to overheating and severe reduction on battery life and can destroy the adapter as well.
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Care to explain why Google says you can charge your device with a 500 mAh charger [standard USB port]? ["with the screen off"]
Won't it severely reduce battery life and burn out the motherboard of the USB? Oh, really? Google just forgot about that part when they were writing the instruction manual?
:silly:

MrSchroeder said:
Science proves other than your opinion. A too-low or too high max voltage or amperage charger can and will lead to overheating and severe reduction on battery life and can destroy the adapter as well.
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Science generally proves things with facts and figures. From a forum point of view, a link is your minimum effort here

MrSchroeder said:
Science proves other than your opinion. A too-low or too high max voltage or amperage charger can and will lead to overheating and severe reduction on battery life and can destroy the adapter as well.
Click to expand...
Click to collapse
Modern devices and chargers shouldn't have this problem because of built-in regulators. A smartphone won't try to draw more than it can handle and chargers won't try to supply more than they can handle (unless they're very cheap).

I have been N7 charger on phone with no problem so far. I wonder about the statement about the phone not drawing more than it needs though. I replaced the battery in my TB after 9 months due to low life and swelling. I'm pretty sure the swelling came from leaving the phone on a car charger all day, even after the battery was full. If my phone had the ability to stop taking the charge it didn't need, this wouldn't happen...
Sent from my Nexus 7 using xda premium

My opinion still stands....I don't trust using anything other than the charger that came with the device. 6th post down makes perfect sense to me.
http://forum.xda-developers.com/archive/index.php/t-1370215.html

Your battery was likely defective. My phone literally stays on the charger all day when I'm not out.

gogol said:
Hi,
Nexus 7 charger ouputs 2A.
Is it safe and ok to use it to charge Galaxy Nexus, Nexus S, and HTC Desire?
I am thinking more in the long run, if it does not brake the phones.
Thanks
Click to expand...
Click to collapse
If the phones also charge at 2A then you should be fine. If the phones charge at lower amps (say 1A or 1.5A) then I wouldn't recommend using it everyday as it may reduce the battery efficiency. If it's an emergency go ahead and use it.

There's no harm in using a higher current charger with a lower current phone because the charger is not what's actually charging the battery, it's the phone, and the phone will limit the charging current. You can confirm this with a multimeter. The charger can't force the phone to draw more current than it was designed for. This would be different if you were charging the battery directly with a dedicated charger because then the charger itself is directly controlling the charging current.

MrSchroeder said:
Science proves other than your opinion. A too-low or too high max voltage or amperage charger can and will lead to overheating and severe reduction on battery life and can destroy the adapter as well.
Click to expand...
Click to collapse
Nope, just nope.
Sincerely, an electrical engineering student.
Sent from my Nexus 7 using Tapatalk 2

My Nexus 7 literally takes hours to charge

My Nexus 7 battery takes forever to charge. And this is even when I use my stock cable to the wall charger. I know it takes around 3-4 hours to charge it from dead to full but for some reason mine is only HALFWAY full at the 4 hour mark and I usually have to leave it on the charger the whole night/day for it to be fully charged.
I have no other defects on this product except for this one. And I never dropped it or anything and I'm currently running 4.1.2.
Please help. I know I can't be the only one with this problem.

Definitely use the oem charger (2 Amp compared to 500-850 ma for most) and the supplied USB-3 cable. It will charge faster. After the long initial charge up to 100% mine has been charging pretty well. If I'm down around 10% it can take up to 4 hrs to charge, but the battery is huge compared to most phones. It sounds like something isn't working normally for you. Have you tried turning it off, then charging?

Yes sorry I was unclear in the original post. I'm using everything stock when I charge my Nexus 7. I don't use any other cable. And yes I completely turn it off when I'm charging but yet it still charges horribly slow.

I would test another comparable charger just to make sure it's not the charger or cable itself.

There is a lot of threads that talk about the charger and the possible ones you can & can't use (Nexus 7 is picky). I use a HP Touchpad USB plug and a cable. It does the job well :good:

Saturny said:
There is a lot of threads that talk about the charger and the possible ones you can & can't use (Nexus 7 is picky). I use a HP Touchpad USB plug and a cable. It does the job well :good:
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+1
I use the HP touchpad charger, Playbook charger and KFHD charger. All three of those get the job done fast.
With those three, I don't even need to use the N7 charger lol
Sent from my Nexus 7 using xda app-developers app

Do you keep it on while you're charging it? If so that will definitely make it take longer to charge since it's using power.

Nope.
brando56894 said:
Do you keep it on while you're charging it? If so that will definitely make it take longer to charge since it's using power.
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Click to collapse
I keep mine on, so I can check the % on screen. And long as you don't use it while it's charging, it won't take longer.

Trust me I keep everything that I charge off so that it can charge faster and not be using any power while charging. It seems no one else has gone through this from this thread though. It sucks that I have to get a new charger when the stock charger should be still working fine and perfectly.

As far as i have read the informations on / in box. It said to use the OEM charger only. I didn't really measure time when charging, but it always took maybe 2-3 hours max to charge the device completely.

Try blowing out your micro port with compressed air, had this on my galaxy2
Sent from my Nexus 7 using xda premium

I use a Samsung charger with the usb cord, i for a USA charger.. Mine also uses hours... Good to know IT Will charge netter with others
Thnx
Sent from my Nexus 7 using xda app-developers app

Slow charging speed via USB

How are those who've got their N10 finding the charging speed? Mine arrived yesterday and has been charging very slowly, as the reviews had said.
In six hours last night on charge whilst left on standby, it charged about 20%. Is everybody else finding a similar situation?
I'm looking forwards to the pogo-pin chargers/docks being released, which will hopefully charge a bit faster! If anybody knows how to hack something together to make use of the faster charging speed on the pogo connection then please do share! :good:

Of course, you have to look at the amperage and watt of your power supply. Even among the AC powered chargers, they vary greatly, and here you are talking about charging this behemoth with a measly powered USB.
Sent from my SGH-T889 using Tapatalk 2

If it takes 6 hours to charge 20% on a 2amp charger than that is seriously messed up.

BamAlmighty said:
If it takes 6 hours to charge 20% on a 2amp charger than that is seriously messed up.
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Not messed up, just physics. There's an awful lot of resistance in a 9000MaH battery, and a standard microUSB (or even full-sized USB) connector can't handle the amperage that a faster charge would require. Which is why most big tablets had proprietary connectors up to this point.
But guess what? Google and Samsung knew this, it's why the N10 has one too, we just don't have the cable for it yet.
Pogo charger is coming, supposed to be at least twice as fast. Don't know why it was delayed, but most likely either a certification issue, or worry about Apple suing for it being too much like a Mag Safe connector.

http://forums.androidcentral.com/google-nexus-10-tablet-forum/225484-pogo-charger.html
Some guy posted the Pogo charger here. I wonder where he got it.

Buy a powered USB unit and plug into that, mine puts out around 5 amps

realyweely said:
Buy a powered USB unit and plug into that, mine puts out around 5 amps
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Are the slow speeds people are getting from the wall charger our from a pc connection?
Are you saying a powered USB hub is charging it quicker than the mains charger supplied?
Thank you
Swype'd at pace from my Galaxy S2

I don't even charge phones via normal USB on PC anymore, let alone a tab. I've found the charging time on the N10 to be ok, provided the screen is off and also if I'm downloading something it seems to slow the charging down. Other than that it's not lightning fast, sure, but I'm ok with it. And so much the better when they release the pogo charger.

charged mine over night yesterday from 10% to full wall mains, but when the screen is one it doesn't seem to charge just maintains current charge which is a bit annoying

Dja357 said:
How are those who've got their N10 finding the charging speed? Mine arrived yesterday and has been charging very slowly, as the reviews had said.
In six hours last night on charge whilst left on standby, it charged about 20%. Is everybody else finding a similar situation?
I'm looking forwards to the pogo-pin chargers/docks being released, which will hopefully charge a bit faster! If anybody knows how to hack something together to make use of the faster charging speed on the pogo connection then please do share! :good:
Click to expand...
Click to collapse
Try turning anything that uses power off (i.e)...turn the screen brightness the lowest it will go, turn the tablet on airplane mode. Turn the sounds off.
I find that helps my phone charge faster, maybe this will help with the tablet.

Are you talking about charging via USB on a PC, or via the PSU?
Through the PC will be very slow at a maximum of 500mA, but the PSU should be able to power it? My N7 and Galaxy Tab 10.1 had 2A chargers - what does the N10 come with?

I am regretring more and more buying this. I haven't received mine yet but the amount of pixels is kind of ridiculous. I would have been happy with 1920x1200 with that beasyly hardware. Saw a review that said their battery only lasted 4 hours because of the insane power the screen sucks away.
Also the fact that this pogo charger will probably cost $50+ and it is something that should have been standard either way.
Oh Asus infinity..why must your I/O be so god awful. You were almost the perfect tablet
Sent from my SCH-I535 using xda app-developers app

Yeah charging is slow, though not as bad as 20% in 6 hours! I think mine was charging faster than that even when I was using it. I think trade off is worth it though with the microUSB connector.

The iPad 3/4 is no better... Takes forever to charge

duarian said:
I am regretring more and more buying this. I haven't received mine yet but the amount of pixels is kind of ridiculous. I would have been happy with 1920x1200 with that beasyly hardware. Saw a review that said their battery only lasted 4 hours because of the insane power the screen sucks away.
Also the fact that this pogo charger will probably cost $50+ and it is something that should have been standard either way.
Oh Asus infinity..why must your I/O be so god awful. You were almost the perfect tablet
Sent from my SCH-I535 using xda app-developers app
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It's just a cable, the charger is already capable of 2a.

cspiby said:
It's just a cable, the charger is already capable of 2a.
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Click to collapse
Well if the cable is only $5-$10 then that's great, however I foresee them milking that cable for all its worth . I'll see when I get mine today how I feel
Sent from my SCH-I535 using xda app-developers app

Lumsdoni said:
Are the slow speeds people are getting from the wall charger our from a pc connection?
Are you saying a powered USB hub is charging it quicker than the mains charger supplied?
Thank you
Swype'd at pace from my Galaxy S2
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Click to collapse
No but it will charge at the same speed as a Mains charger and thats better than plugging into your laptop or PC

realyweely said:
No but it will charge at the same speed as a Mains charger and thats better than plugging into your laptop or PC
Click to expand...
Click to collapse
I got about 40 % in 2 hours off mains
Swype'd at pace from my Galaxy S2

It's nice to know that we have the Pogo pins option for faster charging. It makes me feel better now going through with my decision to get N10. I am a heavy media/game consumption guy so this device is perfect for my needs.
Sent from my GT-N8013 using Tapatalk 2

I must say I would hate to spend an extra $55 (assumed price) for a pogo charger for a tablet I've already spent $550 (tax+ship)

nexus 7 charging awfully slowly !

My nexus 7 has been plugged in since 7 hours and still is just 70 % . using official asus wall charger rated 2.1 A . stock rom rooted device
Problem has been persisting since many days now . usually charges at this rate only ! While at 4.1 it used to be fine but now at 4.2.2 charges this slowly . please help..!

Here you go.

Please correct me if I'm wrong... I've had a quick look through a few of those threads and it seems as if there is no real solution? The charger that the tablet comes with takes many hours to charge the device fully?
Ridiculous! I hate that while I am using the tablet when its charging the battery still goes down (despite being plugged in)!
Sent from my Nexus 7 using xda app-developers app

- you could have a bad battery
- you could have a bad charger
- you could have a bad cable
- you could have a variable amount of power drawn by an active device - which depends on what apps you have installed, your screen settings, kernels used etc cetera. (read : VARIABLE)
- you could be trying to charge the device via a USB port, which provides only 500mA of current - less power than the device uses in certain screen-on scenarios (esp. the 3G model)
Until you run tests which are meant to discriminate between these different scenarios, you will be just wandering around in the dark.
So try this - run the battery down through normal usage (not too far though) - say to 10%.
Then, turn the tablet off (not just the screen, I mean powered completely off).
Then charge it (on the 2A AC charger!) for about 75 minutes. Boot it up and see what the battery charge state is. Then, power it off completely again and charge it more (on the 2A AC charger!) for another 75 minutes. The first 75 minutes should bring it to somewhere around 50% charge, and the 2nd should be enough to bring it to 100% charge.
My (December '12) N7 charges from about 4% to 100% in 150 minutes (2.5 hrs) when it is on the A/C charger. That seems pretty reasonable, as 4.325 A-h / 2.5 hrs = 1.73 Amps.
By the same simple maths, a 500-mA current limit (e.g. USB hub/computer port) should take 8.7 hours to charge the N7 - even when it is completely turned off! And if you are using the device in this scenario, it might not charge at all!
This will at least tell you if there is a problem with the battery, charger, or cable. If it takes too long to charge when there's no software running, then the problem can not be software, right? (There's no software running with the device powered off.)
If it turns out that the battery/charger/cable seems OK in the above test, then the next thing to do is to determine what you have done to the stock configuration (in the way of adding apps, whatever). It's easy to say "4.2.x did this to me" or "4.1.x was so much better", but there does not seem to really be any compelling evidence coming from a majority of users that this is true.
I don't deny that people experience battery troubles; otoh, I'd wager that the root-cause of 95% of the trouble falls into two basic classes: defective hardware (incl. worn-out batteries and/or loose battery terminals), and user-caused software additions/changes.
good luck

I've had experience with 3 models that all three had power issues. Reconnecting the battery cable solved it for me, but in my case the N7 went 'dead' on me, didnt notice slow charging times. Disconnecting the battery cable for 30s then reconnecting and powering up solved the problem for me. Left me thinking their battery hardware assembly is very flawed. Or my local store has had a bad batch.
I found this movie helpful with the unhooking of the connector (at around 3:30)
http://youtu.be/bjh0H6SZHRM?t=3m23s

Many thanks for that response. I will try out for sure.
My nexus device has stock ROM (not rooted) so I hope its a charger issue. Then the issue will go away quickly by replacing the charger.
Thanks again.
Sent from my Nexus 7 using xda app-developers app

Repoman123 said:
Many thanks for that response. I will try out for sure.
My nexus device has stock ROM (not rooted) so I hope its a charger issue. Then the issue will go away quickly by replacing the charger.
Thanks again.
Sent from my Nexus 7 using xda app-developers app
Click to expand...
Click to collapse
if you have a phone or other deive that has the same usb connection try that, my samsung charger charges my nexus in 3hrs :laugh:

chismay said:
if you have a phone or other deive that has the same usb connection try that, my samsung charger charges my nexus in 3hrs :laugh:
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Click to collapse
Yeh it occurred to me today that I can use my HTC phone charger or my wife's blackberry charger and see how I get on.
Am I correct in saying that if the tablet still takes long to charge with those chargers then its an issue with the tablet?
Many thanks
Sent from my HTC Sensation using xda app-developers app

bftb0 said:
- you could have a bad battery
- you could have a bad charger
- you could have a bad cable
- you could have a variable amount of power drawn by an active device - which depends on what apps you have installed, your screen settings, kernels used etc cetera. (read : VARIABLE)
- you could be trying to charge the device via a USB port, which provides only 500mA of current - less power than the device uses in certain screen-on scenarios (esp. the 3G model)
Until you run tests which are meant to discriminate between these different scenarios, you will be just wandering around in the dark.
So try this - run the battery down through normal usage (not too far though) - say to 10%.
Then, turn the tablet off (not just the screen, I mean powered completely off).
Then charge it (on the 2A AC charger!) for about 75 minutes. Boot it up and see what the battery charge state is. Then, power it off completely again and charge it more (on the 2A AC charger!) for another 75 minutes. The first 75 minutes should bring it to somewhere around 50% charge, and the 2nd should be enough to bring it to 100% charge.
My (December '12) N7 charges from about 4% to 100% in 150 minutes (2.5 hrs) when it is on the A/C charger. That seems pretty reasonable, as 4.325 A-h / 2.5 hrs = 1.73 Amps.
By the same simple maths, a 500-mA current limit (e.g. USB hub/computer port) should take 8.7 hours to charge the N7 - even when it is completely turned off! And if you are using the device in this scenario, it might not charge at all!
This will at least tell you if there is a problem with the battery, charger, or cable. If it takes too long to charge when there's no software running, then the problem can not be software, right? (There's no software running with the device powered off.)
If it turns out that the battery/charger/cable seems OK in the above test, then the next thing to do is to determine what you have done to the stock configuration (in the way of adding apps, whatever). It's easy to say "4.2.x did this to me" or "4.1.x was so much better", but there does not seem to really be any compelling evidence coming from a majority of users that this is true.
I don't deny that people experience battery troubles; otoh, I'd wager that the root-cause of 95% of the trouble falls into two basic classes: defective hardware (incl. worn-out batteries and/or loose battery terminals), and user-caused software additions/changes.
good luck
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tried out charging it up from 10 % to 50 % .. took around 3 hours !
similar observations while charging till 100% ..
It turns out that the charger may be faulty . I'll have try out other chargers. The problem is that I am here in india and made my relative bring it for me from the U.S. . I can't find any trusted chargers here . I'll try charging it with the other Sony charger I have (rated at 850 mah ) and compare the relative results . Thanks for the info anyways !

ni15595 said:
I'll try charging it with the other Sony charger I have (rated at 850 mah ) and compare the relative results.
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850 mA is going to charge pretty slowly also. Appearances (simple maths, A-h = Amps * hours) are that to get a 2.5-hour charge (4% to 100%) you are going to need a 2000 mA (2 A) charger.
As I said before, not accounting for losses the 4.325 A-h capacity of the battery works out to 1.73 Amps for 150 minutes. But probably due to losses the current is in fact higher - perhaps very close to the 2A limit of the US OEM A/C charger.
good luck

AW: nexus 7 charging awfully slowly !
This could be the solution:
It seems that the charger marked as 2amp is only 1amp: see this[first result googling <nexus7 battery charge slow>]:
plus.google.com/app/basic/stream/z12pjzqhrnvbcjvhs04cd5gbiz3wg5eqqjg
(Sorry, but im not yet allowed to post URLs, so copy the link into your Browser)
Otherwise, i have the prob that my n7 needs about 20 hours to get fully charged via AC and the charge even decreases if i use the tablet. Has anyone an idea what to do?
Sent from my Nexus 7 using xda app-developers app

OK I've tried different chargers and different locations but still no luck. My n7 takes about 8 hours for a full charge and if I use it while its charging the battery still decreases. Bizarre!
I'm concluding that this is an issue with my tablet? Do u guys agree? Should my next step be to contact Google?
Thanks again in advance
Sent from my Nexus 7 using xda app-developers app

Same problem here ! Apparently it seems like there's no solution of it .

ynrozturk said:
Here you go.
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I have tried to find a worked solution for slow charging but no hope.
I have posted a thread to post my case: http://forum.xda-developers.com/showthread.php?t=2126185
After posting that thread, no help worked! So i came to ASUS to replace the mainboard and it charged normaly again (3 hours to 100%) but no for long, now with turning-off Nexus 7, it takes me sometimes 6 hours, 7 hours, 17 hours to charge....
It happened not only on my device, but a lot of devices of tinhte.vn members.
Hardware issues? I hope I don't need to change my mainboard again...

Get a new charger at amazon....the one with the most highest reviews....now my nexus charges blazing fast....the oem one is garbage
Sent from my Nexus 7 using xda app-developers app

I would agree.. charging is very slow for me thru the oem charger. Utter bull crap. Battery % decreases when I use it while charging.
Sent from my HTC Explorer A310e using xda app-developers appp

akshat.shenoy said:
I would agree.. charging is very slow for me thru the oem charger. Utter bull crap. Battery % decreases when I use it while charging.
Sent from my HTC Explorer A310e using xda app-developers appp
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I use an OEM charger - no problems.
I suppose that Asus could be multi-sourcing them from a variety of suppliers though, and that could account for different experience.
(Either that or something worse - funny business in Asus' supply chain or in the retail sales chain. There seems to no limit the amount of counterfeit electronics from the pacific rim and batteries & charger hardware seem like a likely place for that kind of activity).

GabrielOspina said:
Get a new charger at amazon....the one with the most highest reviews....now my nexus charges blazing fast....the oem one is garbage
Sent from my Nexus 7 using xda app-developers app
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Did you have the same issue before you got that new charger off amazon then?
Can you please share the link to the charger?
Many thanks!
Sent from my Nexus 7 using xda app-developers app

Go to battery menu and make sure it's actually charging in AC mode, I don't like the USB port on this tablet
Sent from my Nexus 7 using xda app-developers app

STLset said:
Go to battery menu and make sure it's actually charging in AC mode, I don't like the USB port on this tablet
Sent from my Nexus 7 using xda app-developers app
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How exactly do I do this? Many thanks.
Sent from my HTC Sensation using xda app-developers app