I noticed that my iPhone's (13 Pro Max) battery is draining fast, like 1% every 4-5 minutes of usage, while when the phone is on standby, it does not drain that fast. I almost turned everything off (GPS, notifications, Background apps refresh...etc) and reset all settings and still, I have the same issue. the operating system is iOS 15.5, the battery health is 100%. any help, please?