It is an old light granted. I have had it sitting unused and decided to try and Resuscitate it. Bought a nicad to replace the original Mod 25170 with a Kastar Rechargeable Ni-MH 6.0 V supposedly made for the Ultra Stinger (I am concerned about the nomenclature of NiMH (I understood that the Ni-MH would work in the Stinger). It charged up or the charger (original) did indicate it was charged. Excitedly put the battery in and, ahhh crud, a weak beam... I mean just a tiny yellow incandescent ... oh well... so (1) how do I test the charger? Maybe it be bad?? Any other help is greatly appreciated. Like this old 'stick' and hope I can get it going. ALSO, as an aside is there an LED replacement for the inc bulb? Thanks!