Thanks Gerhard. I did look into that too. I have tried another battery (same model) and all works fine. So, it is the original battery that has failed - with a short charge cycle. Tim On Tue, Jan 4, 2011 at 9:43 AM, Gerhard Kuhn <gerhardk@xxxxxxx> wrote: > One thing to look at is to click on the graphic of the apple in the top > left corner and then about this Mac. It will pop up a small summary of the > processor and memory and there is a button that says something like more > about this Mac. After clicking that button you will be given more info about > your computer than you want to know, one those bits of info will be battery > info. Among other info it will tell you the amount of charge your battery > has, the number of times it has been charged and it will say something like > normal or needs service. > > Gerhard > Sent from my iPhone > > >