[Q] Battery problem

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http://forum.xda-developers.com – I've been using several custom roms on my Defy green lense and i noticed an issue with the battery life. It happens that every time i fully charge the phone, when it goes to 70% battery life it instantly drop to 50%, battery drain, even with STOCK Froyo. But if i charge it to 69%, not fully 100% or over 70%, it goes normal... Is the battery bricked ? (HowTos)