Hello All! I have a 2.4GHz MBP that I purchased last June. Since the last couple of days, when I am running the computer off the battery, it just shuts off around 20% battery health. No warnings, no sleep- just hard shutdown. iStat lists my battery health as 83% with 67 cycles. What is weird is that it doesn't even warn me as it previously used to. I have performed PRAM reset, but that has not helped in regards with the issue. Do any of you folks have any advice for me? Thanks a lot!