I live in LA, and over the last few months I've noticed that every time I take the subway (which I do quite a bit) my battery life is disastrous. I imagine because its searching for a signal or mobile network or something (and I know someone said this before, but I couldn't find it)... But since then, if I set up my HTC widget and go into airplane mode before I get on the subway - its noticeably better - MUCH better...
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