Harbor Freight Flashlight 18650 Battery Mod

thingiverse

This was a free flashlight from Harbor Freight that saw little use because of its AAA batteries. I thought the best solution would be to use a reclaimed 18650 cell from a laptop that had a less than desirable capacity so both items would have a new life. Tube extender was remixed to fit HF flashlight threads and accommodate 18650 cell. A ground wire (copper strand from random scrap) is fed through the extension to create the electrical connection. 18650 spacer was remixed for clearance. Original file credits below Flashlight tube extender: https://www.thingiverse.com/thing:3458898 Spacer: https://www.thingiverse.com/thing:1874998