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I have 5.0 on my iP4 and the battery can still say 100% in the afternoon when I've had the phone doing quite a bit of stuff during the day after an all night charge. Battery usually lasts me 2 or even 3 (the odd time 4) days before requiring charged again. If 5.1 makes it last even longer, great, if not, I don't see the need to upgrade unless it adds some major bug fixes or new features. I'd hate to update and it makes the battery worse.
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