This one is Wight's 22mm DD+7135. Gonna use it in a 2S3P cell arrangement for light for my wife. Here are the 3 parts needed to convert it over. I decided to connect the LM2936 Batt+ and Batt- input pins to both sides of the C1 capacitor that goes on the pads to the right of the below LM2936 (Mouse over for blank board). The output capacitor needs to be 10uf minimum and needs a resistor to get proper ESR.
Here it is installed. I decided to use 2 10uf capacitors for the output pin. The light will be a momentary switch light and the OTC pads will be used to connect the switch.
It works great so far in bench testing.
Update: Bee using the above driver in this light. Working great. I eventually want to to change the 4.7ohm resistor with a .75ohm resister as recommended by the data sheet for the LM2936.