My Dec '06 MB battery conked out after a month because of the issue some batteries had back then of completely dying if their charge depleted when the MB was in sleep mode. Had a brand new battery within 2 days care of AppleCare. This battery has served me well since, however, according to iStatPro the charge it holds is still at 100%, but the battery's health is at 64%. What exactly does this mean and should I be worried?
As far as I can tell there isn't anything wrong with the battery. I am aware that Li-Ion cells degrade over a period of three or four years, but my MB can still crank out 4-5hrs of usage with Wi-Fi and Bluetooth enabled provided the screen isn't set to it's 'blinding' setting.