Streamlight Stinger XT 18650 Adapter

thingiverse

I found an old police Streamlight Stinger XT at the thrift store for $3, it had the old 3-cell sub-c Ni-Cd battery pack but no charger. Battery is NFG, bulb looked good so I took it home. The original battery pack is 3.6V, so I figured an 18650 cell would work fine and modernize the light. I made this adapter to hold one cell, works fine for an incandescent light. The adapter uses a couple of washers soldered to some 18ga speaker wire to make the connection to the base. To my surprise, the positive spring makes good contact with the top of the cell, so I didn't have to do anything about the Streamlight's ring terminal piece that brings the negative up for the recharging port. I made it with a channel to run the wire connecting the washers or if you have a <5mm bolt or rod, you can run that up the center instead. It's up to you. Next step is to convert the light to LED and see if two 18650 cells will fit (I think so), then make a Li-Po charge controller that fits the stock terminals.