this post was submitted on 09 Nov 2025
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I always thought that charging beyond 85% or so is what degrades batteries. The LiPos of my quadcopter actually actively reduce their charge if left sitting somewhere for a longer period of time. To prevent them from going up in flames.
It does, but the battery charge controller in your phone already does that. What it shows you as 0-100 is 20-80 of the actual battery. Others may or may not.
What you call 0% or 100% on a battery is an arbitrary number anyway. Absolutely never do this for safety reasons, but back when I worked for a battery lab I did experiments where I discharged cells to below 0V.
In a previous job I once evaluated some returned product that wasn't having the best battery life or wasn't working right. It was specialized expensive equipment that used regular alkaline batteries.
TL;DR: ordinary batteries can have negative voltage if you don't give a fuck and just mix your old and new ones in a drawer before you put them into your high-cost life-saving equipment.