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KF Charging Issues? Try Nexus 7 Charger

Charging issues? Try a charger from a Nexus 7.
I have a new Nexus 7, and I was happy to find that the Nexus 7 charger is able to keep my ICS Kindle Fire fully powered at 100% battery, even when screen is left on for 24+ hours at 100% brightness.
Why not just use the stock KF charger like every kernel-related thread reminds us to do? In my case, I have the KF wall mounted to control Sonos music, and the stock charger cable is not long enough to make it to the outlet (see pic below).
[url=http://postimage.org/image/a426h0ihr/]
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For anyone with charging issues with stock charger or who wants to be able to use a longer cable run, give this a try.
PS I did a search for all threads in general with "charge" or "charger" in the title, and did not see this covered.

Awesome! Wish I had a Nexus 7. I would trash my Kindle Fire.
When life gives you tech....Make use of it.

Funny, I have a nexus 7 and for me the oem charger has a very short cable.
I picked up a couple BlackBerry playbook chargers and it works great with them. 6 ft cable as well.
Via my HTC Rezound

All of my KF charging issues went away when I simply booted into recovery and charged from there. Not ideal, but it does charge at the typical stock or CM7 speed of 30% an hour and will do until the kernel issues are worked out.
There is another thread elsewhere here in the KF area talking about amperage and how other Android chargers will not charge very fast. I saw this with my Optimus V cord, have yet to test since I started charging from TWRP.

krelvinaz said:
Funny, I have a nexus 7 and for me the oem charger has a very short cable.
I picked up a couple BlackBerry playbook chargers and it works great with them. 6 ft cable as well.
Via my HTC Rezound
Click to expand...
Click to collapse
Agreed. I used a longer USB micro cable that I got on Amazon, and plugged into the Nexus 7 charger base.

krelvinaz said:
Funny, I have a nexus 7 and for me the oem charger has a very short cable.
I picked up a couple BlackBerry playbook chargers and it works great with them. 6 ft cable as well.
Via my HTC Rezound
Click to expand...
Click to collapse
Yeah the N7 cable is pretty short.

[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

[Q] Battery taking too long to charge

Ok, so at one point, my Nexus 7 started taking about 9 hours to fully charge using the stock charger and usb cable. I thought my charger was dead so I bought a 2.1 amp amazon basics charger with a 6 foot amazon basics usb cable. It still takes hours to charge. I read online that there was a bug with Android 4.2 and charging. The reason this CANT be a hardware issue, is because it happoned out of the blue. Didn't drop it, didn't jerk the cable or bend it in the inside or anything. So what's going on? Please help!
Thanks in advance!
P.S. It looses charge when charging and watching a YouTube video now. It never used to do that.
Sent from my YP-GI1 using Tapatalk 2

baruch6132 said:
Ok, so at one point, my Nexus 7 started taking about 9 hours to fully charge using the stock charger and usb cable. I thought my charger was dead so I bought a 2.1 amp amazon basics charger with a 6 foot amazon basics usb cable. It still takes hours to charge. I read online that there was a bug with Android 4.2 and charging. The reason this CANT be a hardware issue, is because it happoned out of the blue. Didn't drop it, didn't jerk the cable or bend it in the inside or anything. So what's going on? Please help!
Thanks in advance!
P.S. It looses charge when charging and watching a YouTube video now. It never used to do that.
Sent from my YP-GI1 using Tapatalk 2
Click to expand...
Click to collapse
as far as I know, it is a known issue with 4.2.2. I don't think upgrading chargers will work, I tried my iPad's still takes forever to charge. For some reason, the original USB cable works better (at least for me).
Did you install custom ROM's with overclocking maybe?

Nexus 7 SLOW CHARGING

Hi my nexus 7 is charging at a pathetic rate . I left it to charge for 5 hours from 7.00am to 12.00pm and it only charged from 5% to 12% .
It all happened a few days ago . I charged my nexus 7 to 100% (stock rom used for few months alr )and wiped the battery stats . Following that I drained the battery till 0% . After rebooting , the slow charging problem surfaced . I have already did a clean wipe and reinstall of stock 4.1.2 using nexus toolkit , the problem is still there . Help ?

in my country it happened to many people. you should take the nexus to ASUS reparing service and ask them to replace the USB port. it will be ok
Sent from my Nexus 7 using XDA Premium 4 mobile app

dinocrisis said:
in my country it happened to many people. you should take the nexus to ASUS reparing service and ask them to replace the USB port. it will be ok
Sent from my Nexus 7 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
Warranty is over . Asus will probably rip me off for it.
Btw just to note charging is substantially faster when connect to pc . It charges from 5% to 31% in 2hrs .
Sent from my MT11i using Tapatalk

Whether out not your warranty is over depends on where you live. If you're U.S. you are probably out of luck, but you may not be elsewhere - an increasing number of countries now have two years as standard, despite what the card in the box may say.

I have the exact same problem. Started going down hill after install vanir. I thought flashing to stock fixed. it might have for a while. Cant live on stock anyway. Otherwise I don't know what to do with it.

Check your account syncs in settings. I use two different accounts with Google (that real name policy uses a very odd definition of real name,) and if what syncs with each account isn't set just right the poor thing will get stuck awake and trying to sync forever because the awful Google+ will forbid some things without telling the device to stop trying. That absolutely rags the battery.
It's certainly not the only possible cause, but it returns, unbidden, often enough to be worth checking for.

Your situations seem different from mine ...
Anyone has a fix for this ?
Sent from my MT11i using Tapatalk

Fuzzra said:
Whether out not your warranty is over depends on where you live. If you're U.S. you are probably out of luck, but you may not be elsewhere - an increasing number of countries now have two years as standard, despite what the card in the box may say.
Click to expand...
Click to collapse
Mine is a u.s model shipped to Singapore that I purchased online
Sent from my MT11i using Tapatalk

I think my nexus 7 has a bad USB port as was suggested in another thread. A closer look it appears to be severed. Android tuner shows a negative flow. Its been fun anyway.
You can maybe PRESERVE IT BY CONNECTING CHARGE CABLE TO ADAPTER??
---------- Post added at 07:54 PM ---------- Previous post was at 06:55 PM ----------
Fuzzra said:
Check your account syncs in settings. I use two different accounts with Google (that real name policy uses a very odd definition of real name,) and if what syncs with each account isn't set just right the poor thing will get stuck awake and trying to sync forever because the awful Google+ will forbid some things without telling the device to stop trying. That absolutely rags the battery.
It's certainly not the only possible cause, but it returns, unbidden, often enough to be worth checking for.
Click to expand...
Click to collapse
Another thing I didnt think to try was just use a restricted user profile and charge with that.

I fixed problem with "Wug's Nexus Root Toolkit " flashing 4,4,2 and bootloader 4.23(wich i think was my problem becouse it freezing some times when i was in it).
happy flashing and flash it from bootloader, not developer option.

I had all kinds of charging issues for awhile, turns out the battery cable had become loose. Just pop off the back and check that the battery cable is plugged in all the way and seated firmly. The battery itself was also loose and sliding around in its compartment (probably how the cable became loose in the first place), which I resolved with some electrical tape.:victory:
Hopefully it's not worse than that, good luck.

I created a thread about a similar issue. I have the Asus dock. Charging on there is brilliant. Charging via USB is pathetically slow
Sent from my LT26i using Tapatalk

Rcoil73 said:
Warranty is over . Asus will probably rip me off for it.
Btw just to note charging is substantially faster when connect to pc . It charges from 5% to 31% in 2hrs .
Sent from my MT11i using Tapatalk
Click to expand...
Click to collapse
So it could be that your charger is not powerful enough ... Tablet need more than phone usually. I know that because I use the same charger for my Nexus and a Samsung SIII and the time it takes to get from 5% (typical ) to 100% is quite different!

I had this slow charging problem on both mine and my wife's N7. Checked, opened and adjusted the battery connector a few times through few weeks but it did not solve the problem. Later I found out it was the usb ribbon connecting to the mirco usb port behind the speaker was loosen even when locked. I cut and stick a small piece of tape on the back of the ribbon, thicking it slighty, relocking it back in place. Solved the charging issue and both devices are charging back on time properly.

I'm having crazy slow charging recently on my Nexus 7 and I'm trying to figure it out myself.. USB or Dock charge the same; about 300-400mA, that's it. USB speeds. Using the stock charger and cable.
I recently went to AOKP so I wonder if it's something there but I can't figure it out.

I've found that different combinations of USB cables and chargers make a big difference. I have a very long micro USB cable I like to use for charging because the couch is far from the outlet, but attaching that to the Nexus 7 or Nexus 5 wall charger yields a slow charge. If I play a game like Magic 2014 while charging that way, the battery goes down as I play. However some of the short USB cables that came with devices produce a fast charge with both the N7 and N5 wall chargers - the battery actually moves up while playing the same game. So I've resorted to using an old-school AC extension cord and plugging the good cable into that so it can reach the couch.

Nexus 7 Slow charging issue
Rcoil73 said:
Hi my nexus 7 is charging at a pathetic rate . I left it to charge for 5 hours from 7.00am to 12.00pm and it only charged from 5% to 12% .
It all happened a few days ago . I charged my nexus 7 to 100% (stock rom used for few months alr )and wiped the battery stats . Following that I drained the battery till 0% . After rebooting , the slow charging problem surfaced . I have already did a clean wipe and reinstall of stock 4.1.2 using nexus toolkit , the problem is still there . Help ?
Click to expand...
Click to collapse
I had this issue for a long time. Tried all the chargers and ROMs I could get my hands on.
Decided that it should be an hardware problem.
I opened up the Nexus 7 and re-soldered all the USB contacts.
I removed the flat cable that goes from the USB PCB Surface mounted connector and cleaned the contacts on it and re-plugged it.
I removed the battery and cleaned the contacts in there with electric cleaning spray.
I re-soldered the battery contacts on the PCB side.
My nexus 7 now goes from 0% to 100% in about 3 hours.

asrdias said:
I had this issue for a long time. Tried all the chargers and ROMs I could get my hands on.
Decided that it should be an hardware problem.
I opened up the Nexus 7 and re-soldered all the USB contacts.
I removed the flat cable that goes from the USB PCB Surface mounted connector and cleaned the contacts on it and re-plugged it.
I removed the battery and cleaned the contacts in there with electric cleaning spray.
I re-soldered the battery contacts on the PCB side.
My nexus 7 now goes from 0% to 100% in about 3 hours.
Click to expand...
Click to collapse
Do you have a video of how to do that? I've bought a new battery thinking that the problema was in my battery. Did not work well, still with the low charging. I don't want to spend more money. So, do you have a toturial of how you did it?
Thanks

asrdias said:
I had this issue for a long time. Tried all the chargers and ROMs I could get my hands on.
Decided that it should be an hardware problem.
I opened up the Nexus 7 and re-soldered all the USB contacts.
I removed the flat cable that goes from the USB PCB Surface mounted connector and cleaned the contacts on it and re-plugged it.
I removed the battery and cleaned the contacts in there with electric cleaning spray.
I re-soldered the battery contacts on the PCB side.
My nexus 7 now goes from 0% to 100% in about 3 hours.
Click to expand...
Click to collapse
Which nexus 7 do you have, 2012, or 2013? And how did you open it?
Thanks,
kkh5

My N7 charges slow as well. Will try the one posted above and clean the usb ribbon.

OTG Broken And Bizarre Charging Behaviour

Hello everyone and happy Halloween! I have myself a Nexus 10 running CROM Kitkat v7.1 with KTManta Kernel 3.4.86, bought used off Amazon. A while ago, there was a power surge, and my tablet didn't charge for about 3 hours. I restarted it many times, and finally, it charged. Ever since then, OTG doesn't work, the port doesn't output power anymore, (tested with known working flash drives and hard drives) and the tablet doesn't recognise it is charging for any amount of time from a few seconds to roughly 5 minutes. If I use the tablet while charging for anything other than light internet browsing, or I turn on auto brightness, it stops charging, then stops responding to touch until the charger is unplugged from the tablet. I'm pretty sure the surge fried something, but what? And why does my poor Nexus act so bizarrely while charging?
Hand delivered by Miku, my Nexus 10

Hi,
Happy Halloween for you too . Well, I'm sad to tell you, but it seems like a hardware problem. As you said, the tablet didn't want to charge, neither it is able to output power to the OTG anymore. I believe it is was caused by a current peak during the surge. And that probably messed up with your tablet charging port, messing with it is probably sending bad voltages and current on the battery, which can damage it and cause overheating and such as well.
This was my quick diagnostics. I'm not so sure about it, but everything leads to this idea. I'm pretty sure asking you to reflash stock would be useless. But it's worth a try. If the problem is really hardware, then the solution is pretty obvious, and unfortunately hard. Send it to a Samsung costumer care or buy the pieces and try to solve it by yourself.
I'm sorry for your tablet, and wish you can fix it!
~Lord
PS (offtopic).: I'm a big fan of Touhou, nice Cirno avatar . I was playing it before coming to XDA search for any questions hahaha.
"Time is too short to cry, long enough to try." - March of Time (Helloween)
Sent from my KitKat Nexus 10

Yeah, I was hoping it wouldn't be a hardware issue, but I'll try stock, and if that doesn't work, I'll have to go and see how much it costs to fix it... Thanks! And Touhou is quite fun!
Hand delivered by Miku, my Nexus 10

I cannot help with the OTG. For the charging, are you using the micro USB or charging using a pogo cable? If you are not using a pogo cable, you should buy one and try it.