Li-ion 18650 Headlamp Conversion - Longer run times! 1s Li-ion Battery Pack

thingiverse

If you want your headlamp to have a longer run time, lithium-ion 18650 batteries can extend the run time of your headlamp. You can print the case for the battery, and it will just slip onto the headband of your headlamp. It is important that your headlamp runs on 3.2-4.2 volts or 3 AAA batteries in series. If you are unsure, you use a multimeter to test your headlamp's running voltage. Needed Parts: 1x 3d printed case 1x 3d printed lid 1x 18650 li-ion battery a pair of connectors, JST or Xt-30 connectors work Some spare wire Soldering iron and solder Electrical tape(optional but safe for securing wires) Hot glue, or other adhesives (I used hot glue because it is not permanent)