I've just bought a Feb 2011 MacbookPro secondhand but in mint condition. It only had 12 battery cycles (reported by coconutbattery utility) and is still at 86% capacity even though it's 17 months old. The problem is that if it's not connected to the mains it dies when it's still got 8% of battery left. And then when I plug it in it won't restart unless I leave it for a few minutes - which I assume it's using to recharge the battery a bit! Also, when I do get it to re-start, it's forgotten the date, internet password and all the other little things that should still be there. I bought it from someone I can totally trust and will ask him about it but first want to get to the bottom of it myself. It's also still covered by Apple Care so i should be OK. Any ideas - is it just a bad battery or do you have any other ideas?