My computer's battery is 20 mos. old and has a charge cycle count of 313. The health has been at 100% the whole time. It started out at a charge and health of 100% and over 60000 mAh according to both iStat and coconutBattery. Then I restarted the computer and the health was at 81% and the charge was still at 100% and I wasn't sure why, so I restarted it again and it said the health was at 2% and the charge was at 0%. However, it's working just fine and it's definitely not at 0% charge. Does anyone have any idea what's going on?