I am looking for a small flashlight that I can use as afocus light on an underwater camera system. I want one that will take a single 18650 battery. I have two Intova lights that use two CR123batteries that work great but the 18650 battery is a bit thicker and won't slidein the housing. A Wide angle beam would begreat with about 220 lumens such as this http://www.bhphotovideo.com/bnh/controller/home?O=&sku=848958&is=REG&Q=&A=details but the 18650 is too thick. My other dive light uses two 18650 batteries and Ithought it would be nice to travel with only two batteries and onecharger. Anyone have a suggestion?