Chosen Solution
I am currently refurbishing my niece’s 2010 MacBook Pro. I’ve noticed that I’m getting 20, maybe 30 minutes tops out of a fully charged battery with very light websurfing. Here’s the equipment: 2010 Macbook Pro 2.4GHz, with 8GB of RAM Fresh install of El Capitan on Samsung 850Pro SSD Single webpage open in Safari, no other programs running. Both System Profiler and coconutBattery show this battery as having a full charge capacity of 6157 mAh, and 800 charge cycles. Operating on battery shows discharge rate of 10.04 watts in coconutBattery. Voltage shown in System profiler is 12.3V. When connected to a known good charger, coconutBattery shows a charge rate of 18 Watts. I have performed several SMC resets (appears to work, as charge light on charger port changes from amber to green for a few seconds, then turns amber again), as well as reset the NVRAM several times. I have also removed and reinstalled the battery several times. I’m stumped as to why a 6157 mAh battery with only 800 cycles would discharge so quickly. I’ve had batteries well into 1000 charge cycles with 4000 mAh capacities last far longer than this. Any ideas?
CoconutBattery is showing normal charge and discharge as well as listing the battery is showing normal capacity levels. At this point I think you need to try another battery to be sure. Batteries are not just the Lithium Ion cells, they have sensors and a micro controller with programing. At this point I’m thinking something within that part of the battery is faulty.
