Hi, I'm using the first gen aluminium macbook. When I click on the battery indicator it says to "service battery". I then installed coconut battery to check and these are my results. Age of Mac - 31 mths Battery Load Cycles - 58 Battery Capacity 31% The macbook has been 99% used at home plugged into the AC, hence the low number of load cycles. Should my battery capacity be that bad? Do I need to get a replacement battery or just carry on using it plugged into the AC? I'm worried that the battery may destroy the macbook somehow if I don't replace it.