[Q] Battery only charger 20% while off

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http://forum.xda-developers.com – Hey all, I recently flashed CM 10, the stable version, and am loving it so far. The only issue is an odd one. When I turn my phone off and charge it, it will only charge 20%, not a % more. It could be at 40, and when I wake up and turn it on, it's at 60. The battery icon while the phone is off shows that it's fully charged, but it's not. When I turn the phone on and charge it, it charges up to 100 no problem. I'm running the stock kernel and have in no way messed with it. I'm not really sure at all what to do. A battery calibration, re flash the rom? Any help would be appreciated. (HowTos)