Streamlight has created a battery stick that specifically fits their line of popular and powerful Stinger/PolyStinger flashlights This battery stick's chemistry is Ni-MH, that is, nickel-metal-hydride, and it's meant to be a replacement for other Ni-MH batteries Streamlight is a well-respected American company that manufactures the toughest and most capable flashlights out there A battery stick is similar to a battery pack, in that it is actually multiple batteries bundled together The voltage on this battery stick is 36V, more than double the voltage of a typical alkaline primary cell This battery stick is Sub-C in terms of size The Streamlight battery stick is certainly going to become an essential part of your Streamlight supplies!