I often hear people saying that waiting for the laptop battery to reach 0% before recharging will prolong the lifespan of the battery. The sad reality is, regularly discharging lithium-ion batteries to 0% will not necessarily make your battery last longer.
This used to be true when batteries were made of Ni-Cd, due to the memory effect of such chemistry, but Li-Ion maintenance is different.
Generally, keeping lithium-ion batteries charged between 40%-80% is the best for the battery.
The real killers of battery life include keeping it charged at 100% for extended periods of time (weeks or longer) and / or exposing the battery to hot temperatures: Batteries should be kept in a cool, dry place for maximum lifespan.
But no matter what you do to your lithium ion batteries, they will die in a few years no matter how you treat them, so there’s no need to be too uptight about your charging habits.
Check out this link for more information.