WF-501B Battery Extension Tube?

[mwang]

I was just thinking, is it possible for anyone to make an extension tube for the ultrafire WF-501B host to fit 2 18650 batteries? Currently it's possible for 2 16340s or 2 18350s, but I want longer battery life :yh:

 

[Eradicator]

I would contact Mrcrouse. He makes just about anything laser host related these days.