HP 33s battery compartment cover

thingiverse

This is a replacement cover for the HP33s battery compartment. It is phase 1 in my plan to hook up some AAA batteries to power the calculator, which goes through the CR2032 batteries faster than I'd like. I recommend printing with supports, and then trimming away carefully to get it to fit snugly into the calculator base. The versions with bumps are for replacing the coin cell batteries. I'm planning to wire up some AAA batteries with some 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 did not like that; it seems to want the batteries to be independent. So, you could wire up two sets of two AAAs, or you could use the single-bump file and install one coin cell and wire AAAs to the other side.