I've been playing around with my TK11 the last few days with RCR123s from Tenergy. The light accepts them no problem, or so it seems. I can't find if the light is supposed to take those though. Will prolonged use hurt the LED?
its likely limited to 6v like a lot of lights - it may light up but you will pop the driver sooner or later. then its either try to warranty it or repair it. would be a shame
they say ( Fenix) ...NOT two rechargeable CR123As