Mag-Lite 18650 Lithium Battery Adapter

Mag-Lite 18650 Lithium Battery Adapter

The alkaline batteries are replaced by one (or two) unprotected 18650, button top, lithium battery. The 18650 provides 3.7 volts compared to 3 volts from two alkaline batteries. I am currently using a 4.5 volt 3 cell Mag-Lite bulb with a single 18659 battery which works quite well, but I intend to replace it with a LED. LED bulbs are available on eBay and are expected to be the bulb of choice.

For this adapter, you will need to be able to machine the front and rear spacers from aluminum or brass. The dimensions are given in the drawing uploaded to Thingiverse.

The 3D printed adapter holds the battery and spacers in the correct positions and acts as an insulating sleeve. The adapter, with front and rear spacers, provides positive contact with the Mag-Lite switch contact and the tail cap spring.

I expect the 18650 will hold its charge (unused, sitting on the shelf) 6 months or longer.

I have designed adapters for 2C, 2D, 3C and 3D Mag-Lite Flashlights. The 3C and 3D adapters hold two (2) 18650 batteries. To avoid confusion, each adapter is listed on Thingiverse separately.

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Thingiverse links are listed below.

Robonza’s Laser Cut version:
   • Recycle Dyson Battery for a D Cell Fl...  

Thingiverse links are listed below.

Mag-Lite 2-Cell C Size Adapter for 18650 Lithium Batteries
https://www.thingiverse.com/thing:346...

Mag-Lite 2-Cell D Size Adapter for 18650 Lithium Batteries
https://www.thingiverse.com/thing:347...

Mag-Lite 3-Cell C Size Adapter for 18650 Lithium Batteries
https://www.thingiverse.com/thing:347...

Mag-Lite 3-Cell D Size Adapter for 18650 Lithium Batteries
https://www.thingiverse.com/thing:347...