I recently acquired a second-hand (new, for me) MacBook Pro Retina Mid-2012 model. Also, in the near past, I upgraded it to El Capitan, and it is currently on OS X 10.11.1 (15B42).
Last week, it worked flawlessly, and ran for several hours on its battery— until its battery suddenly stalled out charging at 59%, and it started immediately losing power when the the cord is disconnected.
- The battery suddenly stopped charging, and was stuck at 59%, which has since decreased to 56%.
- If I disconnect the charger, it shuts down immediately.
- The battery status is "Replace now" even though it worked nominally last week and only reports having had 65 cycles. I believe it briefly read "Service battery" before that.
I have reset both the NVRAM and the SMC twice apiece. I am going to try to scare up another charger next. Does anyone have any further suggestions to try before paying the money for a battery replacement?
My previous experience with old MacBook batteries has been that they have slowly degraded to the point that they would only hold a charge for a few minutes, rather than suddenly dropping from nominal performance to complete inability to charge the computer, so I suspect the issue is not an old battery, and paying to replace it may not fix the problem.
I share the same problems with this question, however I don't have a warranty to fall back on: New MacBook Pro slow performance, battery not working