AAA R3 parallel charger box

thingiverse

I made it for OPUS BT-C3100 because my NiCd batteries say standard charging at 90mA current, but Opus gives a minimum of 200mA current. To do this, I placed two weak batteries in parallel and got around 100mA current on each one. The holes are for the wire that is soldered or twisted to the back side of the case. One of the advantages is that you can charge eight batteries at once! You need to print, add a bare wire on both sides, and solder it into a loop.