Chosen Solution
Heyo, so about a few months ago I noticed that when I took my macbook off the power adapter, the battery jumped from 80% to 0% and just randomly shutdown. I didn’t think much of it and have been using it since with the adapter connected w/no issues. Today, I was tightening some screws and noticed that the battery wasn’t very in place, and actually was coming up a bit and made it hard to screw. I left it as be and decided to boot up coconut battery, and when I took it off the charger the battery started discharging at about 30+ watts. Any idea what this could be?
Sadly your battery is worn-out! Time for a new one: MacBook Pro 15" Unibody (Early 2011-Mid 2012) Battery
