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Really pure battery in 2.08.1 DC

Hello I finally decided to root and upgrade to 2.1 since sprint was takind their time... so I did and since then I have a battery issues (I already did the clear battery stats). For example I unplugged my phone today (after a fully charged and 3 1/2 hour later with minimum use I only checked my e-mails i am down to 75% I check with Advanced Task Killer Free and there are no extra apps running.... everybody has any idea?
 
I have the same problem every time I install one of his ROMs. It usually takes about a week, but battery life will get really good one day out of nowhere and then its fine after that. I have no idea how or why, but it usually happens after I change my screen brightness and auto brightness gets turned off. The change in battery was never immediate though, so I'm not sure if they're directly related (but I'd be willing to bet they are). Anyway, try turning off auto brightness if you haven't already.
 
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