My MBP battery is at 53% health after 98 cycles. I've tried calibrating it but it does not help. At around 40% charge the charge drops suddenly to around 10% and then after around 10 minutes it shuts down. Anyone got this problem? Is it really true that its only 53% or is it a bug in the firmware? The 53% is just the current health - it goes up and down between 40% and 70%. Thanks in advance.