I get about 10 hours per charge. I'm greedy and want more. I sometimes charge twice a day, because I don't like to get below 20 percent battery life.
I keep my brightness setting on lowest and keep 3G or wi-fi on all the time, unless I'm traveling and trying to save juice. I like Stanza and its dictionary, but the latter requires a constant connection. I could use iBooks and its dictionary without a connection, but I don't buy iBooks because I don't want my content tethered to one company's hardware. I'm looking forward to the Kindle app introducing a connection-free dictionary.
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