With a jailbroken iPhone you can set some things like that up iirc. I had a 5 or 10% setting that would turn the screen off and make it appear battery powered d

With a jailbroken iPhone you can set some things like that up iirc. I had a 5 or 10% setting that would turn the screen off and make it appear battery powered down but it was still on. That way you retain your jailbreak. There were more limitations on cpu speed also. Could turn on the super low power mode (which above setting did), custom max cpu frequency or temperature. Idk about max battery charge but it was nice to be able to control those things. Could make a battery last much longer and phone would not heat up too much. I considered downgrading to get the many features back.