does the Gladius work with 18650 LiIon cells, i.e. do they mechanically fit into the light and will there be any problems with the electronic regulation (battery low warning because of lower voltage)?
Connor - I dont know about the 18650 cells but I run mine on a PILA 168S
It was a very tight fit but once I took the pila wrapper off its not too bad, does not slide out but only needs a little whack on the palm of your hand.
The low battery warning does kick in almost straight away with the 168s but for free lumens who cares /ubbthreads/images/graemlins/grin.gif
I've not done proper run time tests but a fully charged 168s lasts well over an hour.