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Also depends on the phone and how closely it's grown onto your hand. I have three Sony Ericssons which I'd call at least semi-modern - K800i '07, C902 '09 and U10i Aino '10 - and the best battery lifes I've got out of them are 13, 15 and 9 days respectively. In "normal" use both the K800i and C902 gave seven to eight days and the U10i gives five to six days, and normal use for me includes several internet visits and calls a day, as well as the occasional SMS.I think all modern phones have crap battery life compared to the old-school Nokias(at the time I only went for Nokias but I'm sure all the other brands had huuggee battery life too), they used to last days without charge!