This is the replacement battery for our Twin Cylinder Programmable On-Board Glow Driver.  It is a pair of sub-C 2500mAh Ni-Cad cells with a Deans-type female installed to fit our Glow Driver circuit.  It can be charged with any Ni-Cad charger, or with a spare charger from a Hot-Shot type glow plug ignitor.  Just add a male Deans-type plug to the wires on the Hot-Shot charger and you're good to go!