[Q] Android OS eating away battery on stock JB (on NEE)

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http://forum.xda-developers.com – After updating to JB on my SGS2 (NEE CSC, and totally stock) Android OS is eating away my battery. Deep sleep is seldom seen. I Have formated internal and external SD-card, done a factory reset and installed from scratch. I also see others experience this. Any clues on how to find the culprit or is it OS dependant? (HowTos)