not sure if this is the same,, but I have a rechargeable flash light made by stream light(strion model) that has a 12 volt charger I keep in my truck(well been moving from truck to truck as I replaced them its outlasted several trucks!)
I bought it in 1998 and its still on its original battery and still works, doesn't hold a charge as long, but it will run for 30+ minutes still,on a charge
I just bought a new battery for it a few weeks ago, but haven't installed it yet! ! but do plan too, as I also bought a new Strion light, LED model, and a LOT brighter, more features and uses the same chargers(120 and 12 volt) so its going to be replacing old light in the truck, just longer run time and more light options with it!
hope it lasts as long as the original model I have!