I think it was this Brinkmann 3 watt LED that ran on two D cells.
I converted it with the help of @Lynx_Arc to run on an 18650.
here is the discussion of how to modify it
www.candlepowerforums.com
Here is a review by another CPF user
I converted it with the help of @Lynx_Arc to run on an 18650.
here is the discussion of how to modify it
How do I convert a 2D to run on 18650?
I have this light and would like to run it on an 18650 battery. I think that I can wrap the 18650, or 26650 with a plastic sleeve to bring it out to the diameter of a D cell. Make a 55mm long spacer that contains a resistor to make up the difference in voltage between the LiIon, and the 2...

Here is a review by another CPF user