Database Users

Why does this charge so SLOW?

I am completely satisfied with my nexus 7 but it seems to be charging ridiculously slow. So slowly that even browsing with my screen on low, my battery still goes down while its plugged in. And a 1 hour charge with my nexus off only charges it like 20 percent or less while my samsung galaxy player charges 65 percent. I have tried 2 different USB cables and chargers.
Sent from my Nexus 7 using xda app-developers app

Oops I should have put this in q&a! My bad!
Sent from my Nexus 7 using xda app-developers app

Only use genuine charger which came with .
Other phone chargers will not work.
Sent from my Optimus 2X using Tapatalk 2

considering theres much less voltage going through when using the usb(not wall charger) to charge, its normal for it to charge slow. and normal for it to lose battery % while charging it via usb and using the device.

simms22 said:
considering theres much less voltage going through when using the usb(not wall charger) to charge, its normal for it to charge slow. and normal for it to lose battery % while charging it via usb and using the device.
Click to expand...
Click to collapse
Yep.
USB 5v @ 500ma
Phone charger 5v @750-1000ma
Nexus charger [email protected]
Ipad charger [email protected]
Im sure you can see why a phone charger won't do the job
Sent from my Optimus 2X using Tapatalk 2

Even using the charger that came with it, it still takes a good three or four hours to fully charge it.

brando56894 said:
Even using the charger that came with it, it still takes a good three or four hours to fully charge it.
Click to expand...
Click to collapse
A suburban fills up much slower than a Harley.
Sent from my paranoid Nexus 7.

Its a 4000mah battery. Its gonna take a little time to fully charge.
Sent from my Nexus 7 using xda premium

I live in Singapore, can't find a proper 3 pin wall charger for the nexus7..
Sent from my Nexus 7 using Tapatalk 2

Get a HP touchpad international charge kit from Amazon one of the members recommended it to me, it charges in about 2hr 45 minutes full charge faster than the official Charger. Make sure u turn off or nexus to charge the battery faster

nexusboy01 said:
Get a HP touchpad international charge kit from Amazon one of the members recommended it to me, it charges in about 2hr 45 minutes full charge faster than the official Charger. Make sure u turn off or nexus to charge the battery faster
Click to expand...
Click to collapse
I vouch for this. I use my Touchpad charger and it charges to full from almost 10 percent to full in less than 3 hours.
Sent from my Nexus 7 using Tapatalk 2
---------- Post added at 08:07 PM ---------- Previous post was at 08:06 PM ----------
SPreston2001 said:
Its a 4000mah battery. Its gonna take a little time to fully charge.
Sent from my Nexus 7 using xda premium
Click to expand...
Click to collapse
Correct, the bigger the battery the longer the charging time.
Sent from my Nexus 7 using Tapatalk 2

nexusboy01 said:
Get a HP touchpad international charge kit from Amazon one of the members recommended it to me, it charges in about 2hr 45 minutes full charge faster than the official Charger. Make sure u turn off or nexus to charge the battery faster
Click to expand...
Click to collapse
Be careful as the faster a battery charges the hotter it gets and the hotter it gets the faster it's performance and life decrease (all batteries life and charge levels will slowly decrease over time and after soo many charge cycles as parts of it very slowly kinda burn out and are unusable). Also why even fast chargers SHOULD slow down when you hit roughly 90 - 95% as it is not good to cram power that fast in to lithium ion when close to full as this causes the loss of parts of the battery more quickly. Usually it can be apps that can slow things down as well. like my boss kept complaining his phone are 3 batteries a day until a week later I convinced him to get rid of unneeded apps and low and behold it came right back. This is due to apps requesting what's called a wake lock basically telling the device to not go to sleep. This is needed to do syncs, scans and the like, but poorly written apps can juggle wake lock poorly causing bad battery usage when they don't need to.
My tablet charges in roughly 2.5 hours from dead to full using stock charger which is GREAT for a 4000 maH battery.
I also highly recommend turning the OS off and charging via charge only screen (where you see only battery graphic filling up) that would not involve any apps messing with the device while charging.
Also not good to leave device on charger longer than roughly 30 min past full as this could then have charger throttle between fast and slow charge over time (usually due to imperceptible power fluctuations tricking the circuits in the charger to reset and it takes it a sec to realize the battery charge level and adjust back) while battery is full which is very bad to have it in fast charge when it's full as stated (the charger not talking of what some folks call a fast charge mode on some devices (usually used in some way to speed up charging when using a computer USB port)) and is why even manufacturers will warn you if this sort of thing (that is if you read caution statements or manuals)
Sent from my Nexus 7 using Xparent Green Tapatalk 2
---------- Post added at 08:35 PM ---------- Previous post was at 08:16 PM ----------
simms22 said:
considering theres much less voltage going through when using the usb(not wall charger) to charge, its normal for it to charge slow. and normal for it to lose battery % while charging it via usb and using the device.
Click to expand...
Click to collapse
Very true depends on how hard you are running the device. Streaming movies in this mode most likely you will see a loss while simply checking news feeds or light internet browsing it still gains percentage.
Sent from my Nexus 7 using Xparent Green Tapatalk 2
---------- Post added at 08:49 PM ---------- Previous post was at 08:35 PM ----------
ahmadmfz said:
I live in Singapore, can't find a proper 3 pin wall charger for the nexus7..
Sent from my Nexus 7 using Tapatalk 2
Click to expand...
Click to collapse
You mean like this one? I know it's not from Google but is specific to nexus 7 and Kensington usually makes good chargers:
http://www.daydeal.com/product.php?productid=19029
Search for nexus 7 international charger
Sent from my Nexus 7 using Xparent Green Tapatalk 2

Some computer motherboards also offer a high-power mode for USB ports, specifically for charging handheld devices. For instance, here's ASRock's solution.

happyjack96 said:
I am completely satisfied with my nexus 7 but it seems to be charging ridiculously slow. So slowly that even browsing with my screen on low, my battery still goes down while its plugged in. And a 1 hour charge with my nexus off only charges it like 20 percent or less while my samsung galaxy player charges 65 percent. I have tried 2 different USB cables and chargers.
Sent from my Nexus 7 using xda app-developers app
Click to expand...
Click to collapse
I think it charges normally. I come from an iPad 3, which take 6.5hours hours to charge from 0 to 100%. I'm satisfied with 3.5 hours with the N7.
Sent from my Nexus 7 using Tapatalk 2

My Nexus 7 charges from dead to 100% in about 3 hours. That's not slow at all.

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:
Click to expand...
Click to collapse
+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

[Q] 3 Hours of Charging = 30% Battery

I'm unsure what's wrong!!!
My phone has been fine, until it died today. I practice a 1 charge a day rule and I let my battery drain completely before I even think about putting it back on the charger.
Today, my phone died a littler earlier than expected, but that's okay because I was using my iPhone for most of the day. I got home at about 11PM and put my phone on the charger at 11:15PM. Here it is, 2:25AM and my phone only has 30% charge.
I've never noticed it charging this slowly before because I typically put it on the charger before I go to sleep and take it off when I wake up. This doesn't seem normal from ANY phone that I've ever used or troubleshooted in my life.
Why so slow? Is everyone's phone just as slow or should I be concerned?
Edit: I am using the charger that came with my phone in the same wall outlet that I've used since I got the phone. Nothing else is plugged into that outlet, either.

It would seem sensible to try a different charger and power outlet.
Sent from my Nexus 4 using xda premium

Your should be at 100% in that 3 hours. Try using a tablet wall charger.

With my phone, sometimes it charges in a flash, and sometimes it's charging for hours, idk why they do this.

drpepe said:
It would seem sensible to try a different charger and power outlet.
Sent from my Nexus 4 using xda premium
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Click to collapse
I don't have another charger. All I own is Apple products, unfortunately.
I've done other other outlets throughout the house before posting, but I wouldn't see why the one I'm using is compromised in the slightest. It's charged the phone fine since I've gotten it.

dralways said:
Your should be at 100% in that 3 hours. Try using a tablet wall charger.
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Click to collapse
The only Tablet I have is my iPad. I was thinking about just using the A/C adapter, but I was worried that that might mess something up with my luck. LOL.

You can't use the iPhone\iPad chargers as most of them don't comply with the USB charging standard (It will only charge at 500ma, the limit of USB charging).
You said it died quicker than usual as well? Sure nothing is running that drains the battery? Check the battery usage in settings after leaving it unplugged a while and see if you see anything that's using a ridiculous amount of battery.

I've had the same problem. Sometimes I plug mine into a wall charger and it reads Charging (USB) which may be your problem. Other times it reads Charging (AC).
Sent from my Nexus 4 using xda app-developers app

xrsxj said:
You can't use the iPhone\iPad chargers as most of them don't comply with the USB charging standard (It will only charge at 500ma, the limit of USB charging).
You said it died quicker than usual as well? Sure nothing is running that drains the battery? Check the battery usage in settings after leaving it unplugged a while and see if you see anything that's using a ridiculous amount of battery.
Click to expand...
Click to collapse
It's been off of the charger for about an an hour and a half and nothing out of the norm is draining the battery. Screen on time is at 40%, but that's because I was reading all of my sports news and stuff from my device.
Interesting thing to note: I'm at 79% on my Nexus 4 after about an hour and a half unplugged and doing regular browsing. I'm at 98% on my 4s with doing just about the same things as I've done on my Nexus 4, and even watching a YouTube video on my 4s. I've also had a great deal of voice calls and texts this morning to my iPhone. They were neck and neck when I first got my N4 on December 10th. Now, it's dying faster. The only difference is that I've installed Spotify on my Nexus 4 since then... Which isn't running.

Chinese281 said:
I've had the same problem. Sometimes I plug mine into a wall charger and it reads Charging (USB) which may be your problem. Other times it reads Charging (AC).
Sent from my Nexus 4 using xda app-developers app
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Click to collapse
It was reading USB last night! I thought that was normal, lmao... Thinking it meant "there is a USB cable charging it and not wireless charging."
Hm... The plot thickens, I guess.

Yeah it sometimes reads USB but if you unplug then plug it back in, it will change to AC. Not sure how to fix it but that's your problem right there.
Question: are you stock, rooted stock, or different ROM?
Sent from my Nexus 4 using xda app-developers app

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:
Click to expand...
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
Click to expand...
Click to collapse
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.
Click to expand...
Click to collapse
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.
Click to expand...
Click to collapse
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
Click to expand...
Click to collapse
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
Click to expand...
Click to collapse
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
Click to expand...
Click to collapse
How exactly do I do this? Many thanks.
Sent from my HTC Sensation using xda app-developers app

[Q] Nexus 7 will not charge

my nexus7 will not charge until it has completely drained....
I am aware of the current battery problems, but mine is a bit different....
Even after going to bootloader and choosing power off my nexus will sit on charge (wall) overnight and be dead in the morning, even though it was at 30% when plugged in....
The only way to charge it seems to be off my laptop. but even then it takes over a full day to charge.
If i hook up to laptop while runing it basically only slows down the drain but still doesn't charge up....
this is very frustrating, and i'm at my ropes end
would dowgrading to an older rom take care of this issue?

whasty said:
my nexus7 will not charge until it has completely drained....
I am aware of the current battery problems, but mine is a bit different....
Even after going to bootloader and choosing power off my nexus will sit on charge (wall) overnight and be dead in the morning, even though it was at 30% when plugged in....
The only way to charge it seems to be off my laptop. but even then it takes over a full day to charge.
If i hook up to laptop while runing it basically only slows down the drain but still doesn't charge up....
this is very frustrating, and i'm at my ropes end
would dowgrading to an older rom take care of this issue?
Click to expand...
Click to collapse
No solution, I'm afraid, I'm chiming in to say that I have also been having problems since the same time. For two days, I have been trying different combos of chargers, cables, and outlets, to see if other equipment is the problem. But all of it works fine with my Nexus 4. Mostly, I am experiencing that the unit says "charging" but the battery level is going down instead of up. I managed to get a full charge overnight by using an external battery that I got just for this type of emergency backup. After use, it is back down. This morning, third cable I tried finally seems to be working, for now. In 40 minutes it went from 63% to 65%. I am somewhat relieved but this situation is not normal.
I'm going to start reading through the forum to try some suggestions. I wasn't paying attention to updates. Has this problem been triggered by a recent update?
I understand some suggestions call for letting the battery discharge entirely. It seems that won't be hard to do. I can leave it plugged in and, as happened with most of the cables I tried, the battery level will go down to zero pretty fast. I'm really annoyed, but very happy right now that I splurged on an external battery.

Have you tried a new charging block... That would more that likely be your culprit.
Sent from my SPH-D710 using xda premium

I have used 4 blocks
Unless the tablet is killing the charger it is certainly the tab
Sent from my Nexus 7 using Tapatalk HD

whasty said:
I have used 4 blocks
Unless the tablet is killing the charger it is certainly the tab
Sent from my Nexus 7 using Tapatalk HD
Click to expand...
Click to collapse
Check your port for bent pins.
Sent from my Nexus 7 using xda premium

I used three different chargers plus the external battery. Two of the chargers have two inputs (i.e., for Apple and non-Apple products). I have five different charging cords, longest is 6 ft and the others much shorter (two are from Monoprice), and one retractable I usually use in the car. I tried every combination I could think of between chargers, cables, input ports, and several different electrical outlets at two locations.
All the various combos functioned fine with my Nexus 4, the other device I have with me. None of them worked with the Nexus 7. All showed as "charging", but they weren't. In some cases, the numbers were going down quote rapidly. Goes without saying, when you're charging, it shouldn't go from 64% to 59%.
The thing that finally worked - with no hiccups - was the external battery. Since everything worked on the Nexus 4, it's quite apparent the problem is the Nexus 7.
Having said that, by this morning, things inexplicably changed for the better. With the device at around 70%, I connected one of the chargers and it functioned normally. Battery filled up within the normal timeframe. I was using it intermittently while charging, as I often do.
I'm glad it's working and very glad I have the external battery that can fill up both the Nexus 4 and Nexus 7 in a pinch. But I still think there's something wrong with the Nexus 7, and I'm not knowledgeable enough to dare try some of the more technical suggestions. Just the term "shorting out the pins" is enough to warn me that I'm not expert enugh to try anything like that. For now it works, I hope it lasts like that until perhaps I can understand the issues a little better.

I'm having the exact same issue as you guys and it has me stumped. On some days it'll work, others it wouldn't. At first I thought I could fix it by rebooting but last night mine just drained all the way down overnight while charging from around 50% and this morning I wasn't having much luck getting it charged using the 2 stock Nexus 7 wall chargers that I have. I'll try using an external that I got recently and hopefully that'll solve the issue for now at least.
Edit: Some people have had luck reversing the polarity on their charging block. I'll give that a go and report back whether it worked for me or not.
Edit/Update: Yup, flipped my brick around so that the big end sticks off the left side and it's at 32% now from 0% after 2.5 hours. You guys might have some luck with this too.

Nexus 7 fails to charge
We have two Nexus 7 in the house, one 11 months the other 6 months old.* The older one stopped charging just before our holiday last month so we took the other. It stopped charging while we were away.* Fortunately my wife had here Samsung Ace [mains] phone charger with her. This worked every time.*
Once home I checked the two Nexus 7 mains units and 2 Nexus 7 usb cables. No combination would charge either Nexus 7.* The Samsung mains charger would always charge both Nexus 7.
Solution:* Suspicious, I ordered an Asus Nexus 7 cradle while we were away. Any combination of Nexus 7 mains unit and usb cable charges both Nexus 7s on the cradle.
Conclusion: The USB socket on the Nexus 7 cannot take repeated insertion and removal of the cable.
Hope this may help somebody.

Yea I had the EXACT same story as you. I had for got to take my nexus 7 charger on holiday but I had my Samsung galaxy ace (s5830i) charger so I used that. when I came back and pluged In my charger It said that It wasn't charging so I used my brothers nexus 7 charger but still no good. It said that my brothers nexus 7 was charging but not mine and than I figured out what I had damaged... My nexus 7 charging port. I had proved this by comparing the the 2 charges and they where very different... Luckly It was still under warranty so I took it to (I cant tell you that). I looked all innocent and pretended I was new to this stuff and they then tried to charge it but no use so they replaced it with a new one but now I know not to put different chargers in my new nexus 7 and that goes to people out there as well
Sent from my Nexus 7 using xda app-developers app