i was speaking to one of the technitions at my university and he was saying that with laptop batterys you should not always charge it full and run it down in the device. once in a while you should take the battery out and allow it to de charge naturaly. after this give it a full charge without turning it on. you should repeat this prosess once in a while to keep the battery good. sorry for the bad english but does this apply to mobile batterys as well.