We have 2 stingers, 1 poly stinger and the UltraStinger and they all use the same charger with no problems. I use both the 110 and the 12v depending on the application we are using the light for.
I saved a lot of money by just buying the UltraStinger and no charger. You will be very happy with your new light
So they must have voltage dropping circuit built into the light itself. I have a US that came with 2 chargers, & would like to get the smaller stinger. I would have never guessed they used the same charger, due to the voltage difference. TX