
CR123A (16340) to 18650 adapter.
thingiverse
You can transform a CR123A (16340) into an 18650 LIPO battery using this adapter. I've successfully tested it in my Ultrafire WF-502B flashlight and it functions just like a genuine 18650 battery. When your print is complete, you'll need to screw in a 32mm bolt at the top for connection purposes. I highly recommend using a RCR123A battery, as it has the same voltage as an 18650 cell and ensures optimal performance.
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