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I have to say, since getting my iPad1 in Dec 2010 I have not used my PB360 or BeBook eInk devices, and have done all my reading on the iPad (using BlueFire Reader for ePub/PDF and readMe for FB2). I also use the device daily for emails, work documents (GoodReader) and movies, and have been singularly impressed with the battery life.
Even watching movies I get 10 hours of battery (I check the battery % and compare to the movie runtime and find these are always consistent with estimating 10 hours of use, and I have no unusual drops in battery remaining %). I usually try to run the device down a little, so that I am not always trickle-charging and keeping it topped up, but naturally if I know I will be away from power sources when travelling on holidays or business I do keep it topped up. But usually it gets a good rundown and charge every 1-2 days depending on usage.
Once or twice after a recharge overnight the battery has only gone up to 67%, but I find if I disconnect and reconnect it will charge up to full. There is obviously some power management bug there but I am not overly concerned yet.
Apple definitely got something right on the power side of the iPad (and the rest, quite frankly!). Well done!
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