Hi, Yes your battery cannot "hold" the clock time between startups. Test by shutting down for one or two minutes, does the clock still revert to 2001? I asume you use the iBook predominantly with the extenal power supply? cheers, Bart Hanson. "Janice F. Jorgensen" <janicejorgensen at charter.net> wrote: > When I turn off my ibook.. And then eventually turn it back on..... > I now > get a notice about my battery /clock reverting to 2001. > > Is this an internal battery issue? > What do I do? > > Thanks > > Janice > Ibook usb dual 500 mz... Old but working very well