I've not personally tried it, but there have been people who have had success removing their iPhone batteries and getting old devices to power via Lightning.
https://www.reddit.com/r/androidafterlife/comments/zpya9p/i_...
https://www.reddit.com/r/androidafterlife/comments/zpya9p/i_...
edit: that's a rather old v6 in link...think they started with their authenticating components after that