That's because batteries don't always hold their full capacity and might degrade overtime, So, how do you get a read out of battery health to know if your laptop's battery is due for replacement ...
Mac notebooks equipped with Apple silicon use Optimized Battery Charging, a feature that's designed to prolong the battery life and battery health of your Mac by reducing the rate of chemical aging.
Rather than waiting for something to go wrong and getting hit with an unexpected bill for repairs, AAA said it's better to be prepared and get these things checked now, so you don't waste your money.