Mag-Lite 2-Cell C Size Adapter for 18650 Lithium Batteries

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.

The two (2) C cell alkaline batteries are replaced by one (1) 18650, button top, lithium battery. I have used the unprotected type. The 18650 provides 3.7 volts compared to 3 volts from two C cell alkaline batteries. I am currently using a 4.5 volt 3 cell Mag-Lite bulb which works quite well, but I intend to replace it with a LED. LED bulbs are avai