The heat produced by prolonged use and leaving it on the charger for extended periods can degrade a notebook battery very quickly.
MSI X370 Battery detail:
Battery Type: Li-ion
Capacity: 4300mAh / 8Cell
Size: 216.01 x 93.05 x 15.07 mm
Color: Black or White
Compatible original Battery Code:
MSI X370 Series
MSI X370X Series
Q:Should I totally discharge, then recharge my MSI X370X battery occasionally to make it last longer?
A: No, discharging and charging does not increase the life of a Lithium Ion technology battery.
Q:If I install a modular bay battery, are my primary and modular bay batteries working at the same time to power my laptop computer?
A:No, the modular bay battery is used first, then the system automatically switches to the primary battery. This is a deliberate design to allow the most amount of run time to remain in the primary battery in case the modular bay battery is removed and replaced with an optical drive.