My GNex Battery gets to 30% then just dies.

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http://forum.xda-developers.com – hi i have a Gnex im using >Codenameandroid v3.3.2 >Trinity kernal Everytime my phone reaches around 30% my phone just dies, then wont start till i connect it to a ac wall charger. i have two batteries and at first i thought it might of been a ebay battery i purchase but it does it with both. any help? (HowTos)