How does charging a phone beyond 80% decrease the battery’s lifespan?

Question

Samsung and Apple both released new phones this year that let you enable a setting where it prevents you from charging your phone’s battery beyond 80% to improve its lifespan. How does this work?

In: 2724

Answer 1

think of it as a rubber band.

stretch it to it maximum (100%). over a period of time, the rubber band would lose its elasticity.

stretch it any amount less than that would “preserve” the elasticity and let’s you use the rubber band more effectively for longer than if you 100% it to its limit all the time.