As per my previous thread my obsession with all things 18650 continues. This time I’ve two dead bike lights from aliexpress with bad batteries in them. I wired them for external power and built an 18650 holder from pvc pipe. With some spring/plate shims between them I think you could make multi-cell batteries using this technique.
The base with the spring attached is embedded in the bottom cap with a pool of silicone sealant that also attempts to seal the wire entry. The blue wire goes up beside the battery to the cap, there is a cutout in the base to allow it up the side.
The cap is similar to the base, it’s narrow at the top to fit into a recess on the threaded cap.
The end result will hopefully last a while.
The goal is to improve my visibilty at 45 degree angles for vehicles approaching from either side.
Source files 18650.zip (13.8 KB)