Chosen Solution
I bought a new battery through iFixit about a month ago, installed it successfully, but it’s never been “right”. After about 2 weeks, the reported charge capacity via system profiler was roughly half, and it keeps going from 100% charge to 7% in about 15 minutes off the charger. Thinking the battery needed calibration, I’ve followed that procedure several times after installing it (run the battery completely flat, then charge it and keep the power adapter plugged in for 2h afterwards). I tried resetting the SMC several times. I even tried calibrating the battery, then resetting the SMC. None of it has worked. I’m at wit’s end. This battery has 20 cycles. It should be nearly 8800mah, not 150.
Contact the iFixit store for an exchange sadly you got a bad battery.
