Apple actually does this both with your iPhone battery and your AirPods but it’s automatic and you can’t ask to switch to that mode. I see it holding my AirPods

Apple actually does this both with your iPhone battery and your AirPods but it’s automatic and you can’t ask to switch to that mode. I see it holding my AirPods at 80% overnight quite a bit. They call it “optimised battery charging”. I use my AirPods so much all day every day I do wish I could ask it to use that mode permanently.