HP 33s battery compartment cover

thingiverse

This is a replacement cover for the HP33s battery compartment. It's phase 1 in my plan to hook up some AAA batteries to power the calculator, which eats through CR2032 batteries faster than I'd like. I recommend printing with supports, and then carefully trimming away to get it to fit snugly into the calculator base. The versions with bumps are for replacing coin cell batteries. I'm planning to wire up some AAA batteries with contacts on the bumps to make the connection without soldering the calculator. I tried wiring one set of two AAAs to both batteries, but the calculator didn't like that; it seems to want each battery to be independent. So, you can wire up two sets of two AAAs or use the single-bump file and install a coin cell on one side with AAAs wired to the other.