A battery may have a limited number of charging-recharging cycles. So depleting the charge obviously decreases this number, and thus battery life.
Lenovo ThinkPads also have been known for their good batteries.
Lenovo ThinkPads also have been known for their good batteries.
I've seen cheap laptops where the battery lasts but for the expensive ones (that say have a discrete GPU) seem to have good battery life for a few months.
Some of it might be that the big ones have to abuse the battery we had since the T.S.A. won't let you take a big laptop with an accordingly big battery on the plane.