Many years ago I purchased a Fenix TK70 for my birthday. I decided to treat myself and spent about $240.00 on the light, a battery charger, 4 high capacity NIMH D cells, and a tactical pen. In a nutshell, the light was\is great, the charger cooked batteries, the batteries stunk (Tenergy), and the tactical pen I still laugh at every time I think of it. It seems everything these days is "tactical". I have no idea what became of the pen, the batteries no longer keep a charge longer than 2 weeks even if not used, and I threw out the charger. I tried some Powerex cells, but they were worse. Anyhow, I want to get my TK70 to work with one 26650 cell. I am not aware of an adapter that will do this. Can anybody help??