On the 2 HSDPA/3G phones I've used (Blackjack and 8525), battery life was abysmal, largely because of the 3G thing. It's well-known that to improve the battery life on those phones, you have to make them strictly EDGE. Battery life was such a problem on the Blackjack that Cingular started packing in an extra battery for free!
It is still unfortunate because 3G allows things other than just high speed surfing - call quality is better and you can use data and voice services simultaneously.
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