Holy crap, I can use my Evo.
Battery life is a common weakness around high-end smartphones. The HTC Evo is a great phone, but it holds a charge about as well as I do. This isn't such a pain day-to-day. The Evo can (just barely) make it through a day at the office or a night out on the town. But conventions are a different beast entirely.
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I was able to make it through E3 with a stock battery, but only with frequent top-offs and careful power rationing. I didn't want to deal with that at the MeeGo Summit. I googled 'extended battery, evo' and ended up finding this. The Seido Innocell Extended Battery is a 3500 mAH monster. There are versions for most of the high-end Android and BlackBerry devices. The Epic and iPhone 4 are notable exceptions, although Seido is working on something for those phones.
I ordered the giant battery and a special case meant to protect its bulging self. It arrived the night before my flight. I charged it up while I slept, unplugged it in the morning and went more than twenty hours without a top-off. In that time, I watched four episodes of the X-Files and did about three hours of dedicated browsing. I also had music going pretty much constantly.
By the time I reached my hotel, the Evo was only down to about 20%, which means there was still another hour or two of browsing/media left. Over the last few days, I've had WiFi active constantly and used my Evo liberally for browsing, note-taking and picture-talking. Not once did it drop below 40%- and these were 9-10 hour days.
If you're a frequent traveler or a power-user, I cannot recommend the Seido Innocell extended battery enough. If the bump caused by the 3500 mAH model bugs you, they also have 1750 mAH models that still deliver significantly more charge than your stock battery.
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Like most huge nerds, I have a very rapid rate of device turnover. I like to replace my smartphone every year (thanks Sprint!), but I don't think I'll upgrade to a new phone until Seido launches an extended battery for it. Going back to a stock battery would be unbearable.