So this idea may not seem fine about turning our phone off, but it could work. Yes, surprisingly, leaving our phone for some time will reduce our iPhone's battery percentage. Eventually, our iPhone will have zero battery, automatically power off iPhone 13. The only downside of this process is that it takes a lot of time for this method. It could take hours or even days before our phone turns off. So this method can be used if we have a lot of time to turn off our phones.