Macbook battery out of sync
Hi guys, so I recently sent my Macbook M1 2020 to apple to get my battery replaced (had 40% health) they initially quoted £250 but then wanted to change my logic board for an extra £450 (everything else was working fine, it was JUST the battery which was a prominent issue). Which I found quite outrageous to be honest. I got them to send it back instead, no repair and I took it to a 3rd party. I have got my Macbook back from them, and he told me to fully charge it first. So I did, and I noticed once I took it off charge the battery didn't drain. I got about 4-5 hours of hard use from it (on purpose to drain the battery), and it eventually went to black screen. I went to check and pressed the power button and it and it rebooted at 10%, before shutting down after 1 minute. I then plugged it in, and it booted up 1 min later at 100% and again it isn't draining. I assume this is more of a software/ calibration issue (I've tried the calibration thing but to no avail), any tips would be great :).
System Information says it's at 100% health, as well as "Coconut Battery", but again the key issue isn't the performance it's just that it doesn't show me the real battery % on anything.
MacBook Pro 13″, macOS 15.2