[Nexus 10 Q&A, Help & Troubleshooting] Doctor Dedroid:
So curiously... my battery got to the point where it could no longer keep the device turned on.... I had resorted to leaving the thing plugged in all the time and that worked for a while. Eventually even that could not do it... oh it would start up say, but then it would re-optimize all the apps taking about an hour to do so... all kinds of grief... eventually it would not even start...

Got a new battery from newpower99 (much cheaper than they used to be!). Well that helped a lot! BUT when the thing got to 22% to 25% ... it would shut down. I tried tricks like clearing the system cache, various charge/discharge procedures and so on.... Nothing *seemed* to affect it at all... So I gave up trying. Then at some point.. *somehow*... the battery stats straightened itself out! Since I had given up on it I don't know exactly how it happened but I think it was multiple charge cycles with the device turned off... then turned on while still connected and allowing the device to come up to 100%. I had also cleared the system cache a few times... but all at (afaict) at random.

The device worked fine (battery-wise) although it's battery life wasn't quite up to the level I remember when it was new... until the 4th of july week (last week). I had set the thing down for the night (turned on). The next day I picked it up and noted that the notification lamp was flashing (e-mail most likely). I tried to wake it up... and it would not wake. Tried swiping... pushing the power button momentarily, vol. up/down... nothing so I rebooted.... got to the google screen and no further! I brought up the bootloader figuring... time for a factory reset maybe... I got it into recovery (no command, andy on his back!) ... tried to reboot again.. Then I couldn't get it into recovery at all... just the dang google logo.

Well I had backed up my personal stuff on the sd card but not much else... once I discoverd that the Nexus Root Toolkit could see the device when it was in bootloader mode, I unlocked (smoking everything) and flashed the last manta release available. Well did have to do a factory reset twice... (the NRT would have done that but I fat-fingered the selection!) but I got it booted up and it seems stable.

The odd thing about this however is the fact that the battery stats seemingly fixed themselves... well it's still on stock, but I left the bootloader unlocked for the near term. Not like it's under warranty

For those of you who find it charging up to a certain level and then jumping to 100%... I think the procedure I followed originally (which didn't really work right away) was:

1) run the power down until it shuts off....

2) plug it in and power it up into recovery...

3) wipe the system cache...

4) unplug it until it dies (don't reboot.... just leave it...)

5) charge it up (while turned off)

6) when it *thinks* it's full, power it on

7) odds are the battery WONT be at 100% when it does come up... keep it charging until it hits 100% or until you're convinced it won't go any higher.

8) run it down again (by using it...) and charge again while power is off ... I THINK!

The claim was this would do it. I did this a couple of times though.... like I said, once I gave up it actually *fixed itself* and I was on Stock th entire time.