Battery not charging past 82%! Help!

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http://forum.xda-developers.com – Hi, I bought my GSM galaxy nexus about 2 months back. I unlocked bootloader, rooted and installed stock JB, with franco.kernel. It worked fine for maybe a month. Then, charging the battery started maxing out at lower than 100%. Now, it does not ever charge beyond 82-83%. (in battery settings, it shows "82% - Not Charging" even with the stock chrger plugged in. I also charged using USb, the iPhone adapter, and another samsung charger. I put this 82% charged battery in my friends GNex, and it showed 96% on his phone. It even charged to 100% without any hassles. I put his phone's ba (HowTos)