My 60G ipod was fully charged about 6 months ago. Afterwards, I did not use it until yesterday. Surprise, when I turned it on, the battery status remained fully charged, no leakage at all. What kind of battery is Apple using for its ipod, ipad and iphone series. What I know is that it is lithium-based battery with no memory effect. I have no idea that the battery's charged capacity will not leak even for a certain period of time.