There is no need to drain lithium-ion batteries fully before recharging, meaning less maintenance, though they can catch fire if overcharged.

CNN: Quick fix for Dreamliner looks less likely, experts say

There is no need to drain lithium batteries fully before recharging, meaning less maintenance, though they are subject to catch fire if overcharged.

CNN: NTSB: Faulty Dreamliner battery was not overcharged