Chosen Solution
As stated above, my battery purchased from iFixIt has 82.2% capacity left on it after 49 cycles & 683 days. According to Apple’s Battery Cycle Counts the battery of a MacBook Pro (Retina, 15-inch, Early 2013) should be 1,000 before it starts to go below 80%. I understand an aftermarket battery may not get cycles up to that level, but shouldn’t it still be at least 90% capacity? I just downloaded CoconutBattery, so I don’t know what the battery has looked like over time. I only noticed today because I’m looking at upgrading to a new laptop and selling this one to a friend. I want them to be informed of whatever the condition is, in case they need to expect to re-replace the battery soon. I don’t leave it plugged into the charger, though sometimes if I don’t use it for long enough it needs charged a bit before it’ll power up. Edit: As of just a few hours later the battery capacity/health now says 79%
It’s 683 days, cycle count is not the only thing that causes the battery to degrade, it can expire just on its own.
