iPhone charging experiment

I tested with my iPhone 11 Pro the rule of not charging it more than 80% and discharging more than 20%. After two years, the maximum capacity of the battery is 93%.

My mom’s iPhone SE is about 1.5 years old, she didn’t follow any rule for charging it, and it’s at 91% maximum capacity.

In a perfect world, your battery never goes below 20 percent, and also never above 80 percent.