If you have more than one light on your gun, this is probably something you could use, the Echo Arms Monolithic Twin Light Mount…
If you are unfamiliar with Echo Arms, they make a number of different light bodies to include their Monolithic Twin Light Mount. This one in particular uses a CR-123 battery on one side and a rechargeable 18350 on the other. They take any SureFire scout style tail cap as well as any of your modern light heads such as SureFire, Modlite, etc.
I have mine set up to work in duel spectrums. The CR123 side has a B.E. Meyers KIJI infrared illuminator and a tailcap that allows a Modlite dual lead switch to active the light and Steiner OTAL IR laser at the same time. So I am set for the IR spectrum. Then a protected SureFire Scout clicky switch is used to activate my SureFire Turbo light head on the 18350 side.
It is a pretty awesome set up for running illumination in two spectrums.
Loadout
Sons Of Liberty Gun Works Rifle