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I don't have an iPad of my own, but the girlfriend does and she definitely noticed a bigger battery drain. The rest of the internet has as well, according to Google. Most seem to think it's the addition of multi-tasking and improperly-behaving apps. Of course it could also just be iOS 4 is more resource-hungry than iOS 3, as evidenced by its poor performance on iPhone 3G models. I personally didn't notice much of a battery difference between 3 and 4 on my 3GS, but then I jailbreak and was using multi-tasking apps on 3 so I was already using a fair amount of battery per day. As long as I plug in each night before going to bed, I have enough battery to get through the day.
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