i read that a battery with half a charge gets worse reception. It takes alot of juice to ping out constantly. Get an app like anycut and turn everything off till you need it then just hit the on button.
The official numbers for battery life are very good for 3g. 7hours which is about 2 hours more than iphone and 250 minutes on standbye which is about 50 minutes less than iphone. If you're seeing really bad numbers then its just usage.
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