I think the battery life just gets shorter over time. I've had mine a year now and it won't get me through a full day without a charge.
Time to go see a genius then mate, i've just been reading up on the whole warranty thing and a battery that doesn't preform is classified as a defect and is covered by warranty.
just checked too and i got my phone on the 18 of December last year so its not even a year old yet and i'm lucky to get 4 hours of usage out of it.
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