I charge my iPhone 7 from somewhere around 30 or 40% all the way to 100% every single night. I’ve been doing this for a year and a half, and it says my maximum capacity is at 86% of the original capacity. Since I’ll probably upgrade once the next cycle of iPhones come out, I don’t think I have to worry about my battery health too much.
By the way, how does one go about “quick charging” their phone? Is it a cable thing? Something else? Thanks in advance.