I bought a 2013 macbook and decided to reset the smc (for no specific reason), and now the design capacity, which was around 72%, is all messed up. Not to mention that in terms of mah, it dropped from 3770mah to 3600mah and now, when I went to see it, it dropped to 3500mah, in 1 day. I went to measure the battery there and now the design capacity measurements are fluctuating a lot, it reached 68% it went up to 77% and now it has dropped again. Can SMC reset mess up battery measurements?
No. It’s a 10, almost 11 year old laptop I’d say it’s just time to get a new laptop as I don’t know how someone has used something so old for so long.