My Axim x51v that I use largely for ePocrates. It never seems to last even half a day even with bluetooth and WiFi turned off. Of course, my now 2 years old Sprint A900 seems to need charging ALL the time. I never got to pick up one of these batteries and would LOVE one!
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I'll add to the chorus of people with power-hungry smartphones. My AT&T Tilt never stays happy unless it's charged every night. Of course, it probably doesn't help that I always have Bluetooth on and constantly stream from Internet radio and my SlingBox.
This one is all about me and my iPaq 4355 ... I love that beastie, but the battery isn't quite what it used to be, and I need it to last longer so I don't have to constantly worry about lugging the huge adapter around with me!
My Wibrain B1H only gets about 2 1/2 hours before it runs out, but I'll use this to power my Z800 HMD so that I don't tie up the single USB port on the Wibrain
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