How long will Apple's battery health remain at 85?

Two to three years. After 500 to 800 cycles of full charge and discharge, the longest service life of apple battery will become 85% of the original. Under normal use, the apple battery can be used for 2 to 3 years, so the remaining 85 of the healthy apple battery can be used for 2 to 3 years. Apple battery health refers to the state and remaining capacity of the battery of iPhone or other Apple devices. It estimates the ratio between the current capacity and the original capacity of the battery through an algorithm.