Old MacBook Pro’s MagSafe charger stops charging randomly after battery hits 80%

So I’ve got a mid-2012 MacBook Pro that I mostly use for photo editing. Lately, the MagSafe charger will power up the laptop fine, but once the battery hits about 80%, it just stops charging altogether and the battery icon switches to “Not Charging.” I’ve tried cleaning the MagSafe port and the charger connector, and even swapped in a different genuine Apple charger, but the problem persists. I’m running macOS Catalina, and I’ve checked battery health in System Report - it says “Normal" but the cycle count is around 900. I want to avoid replacing the whole battery or logic board if I can, since this machine still works great otherwise. Has anyone seen this charging cutoff behavior before? Could it be a software setting or a battery calibration issue that I can fix without hardware swaps? Also, is there a way to reset or recalibrate the battery charging thresholds on these older MacBooks?