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are you using extras like wifi or gps?
normal use maybe 5-6 hours on 1440, i've never really drained all the way although one time I forgot it on overnight playing mp3's about 11hours with the display off. with the linksys wifi I'd say around 3hrs max.
with my 3800 I havent tested either.. but i get 5 or 6 hours with wifi, without i'd probably get around 10 or more. I never let it drain more than 30% on either anyway because I can just charge it in the cradle. It will also depend on your brightness and how much cpu you're using. I usually have mine above the mid level which is pretty bright and in 400mhz
axim has one of the best battery life versus other pocketpcs
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