Chosen Solution
SO, I replaced a bulging battery yesterday with an Ifixit replacement. It worked great after the replacement, ran the battery all the way down to help condition it and calibrate. After the macbook shut down I put it on the charger and it sat amber for about 4-5 hours. Something seemed off, so I booted it up to look at it and there is a triangle with an exclamation point in the battery. So I reset the SMC, no luck, next I reset the NVRAM, no luck. Ran a diag, says battery needs serviced, the weird thing is I cannot login at all, it gets about 20-25% of the way through the login screen then it reboots and I’m back to square one. I have tried to restart and do ye ol’ cmd+r, nothing, just boot loops. Tried safe boot, no luck. Anyone have any ideas, my guess is a $@$* battery, just weird how it worked fine on the battery after install but when it powered down it seemed to $@$* the bed.
Batteries are a painful topic, if you do a search on the forum questions you’ll see there’s someone having troubles every day, especially with aftermarket batteries. Your Mac runs off charger only too, thus you have an easy testing tool available, just unplug the battery from the board and see what happens. If it’s a battery issue the Mac will boot on its own and allow normal operations as soon as you connect the magsafe charger, in which case just ask for a battery replacement. If the issue is still there..well, let’s hope it’s not there to start with ;)
