About this 3D model
This thing lets you design an adapter to exchange different kind of batteries! The STL here is for an A13 zinc/air battery in place of a LR44 (or SR44), because it happened I had these around, otherwise useless to me. Make sure that the voltages are compatible though! (here I have 1.44 volts instead of 1.55: lower is safe but may not work properly)