Converting a 41C to run on CR2032‽‽‽

[jonese]

Yea, saw that a few months ago.

Problems
1) What happens when you also plug the USB in? Probably need to bypass the USB charge circuit...
2) Wasted energy in stepping up/down to get the voltage the HP Prime expects.

At that point, it's probably easier just to power the Prime with an external USB power bank (does that work without the batter installed? Havn't tried).