Hi all, up until this weekend, my battery has been reasonably ok for a 6-year old machine,with Coconut Battery showing it as 75% of its design capacity. However, on Saturday, it suddenly shut down at 40% or so, so I charged it up and then it did it again, with Coconut showing it as 35% of its design capacity. I've discharged and charged it a few times to see what happens, but to cut a long story short (too late!), I'd feel bad selling it to someone unless I knew the battery was up to scratch. Coconut only shows 304 charge cycles so my question is, under what circumstances have you known Apple to replace a battery on an out-of-warranty Mac, free of charge? Does it need to meet a minimum performance at all? I can quite easily replace the battery myself and buy the battery from iFixit, but do you think it would be worth taking it to Apple first to see if they would definitely charge me for replacing it?