[Ecks]

Most Laptops use 18650 batteries, which have a high duty cycle, thus even if you discharge and recharge a lot won't kill the battery, the laptop I am on is ancient comparatively and even though I leave it plugged in 24/7/365 the battery has yet to fail, however My "business" laptop has had its battery fail because It was often fully discharged, also if a single 18650 becomes unbalanced or dies, it can kill the entire set.

You can learn more about 18650s here.