ill try to make this less confusing. . anyways. . lets say u have an ipod in your hand.. and the battery if like almost full .. soo u connect your ipod to the AC adaptor and let it charge.. once it gets fully charged. .u leave it there over night ..still connected to the AC adaptor.. soo my question is ..will leaving the battery there affect the life of the battery?? ..like if i had an ipod and took it out of the AC adaptor once it is fully charged ..the battery life will last like for example ..3 years .. but if u kept the battery connected to the AC adaptor everytime ur not using it will the battery life be like.. 2 years??