FITS THE IR-HUNTER / REAP-IR / IR-PATROL / SNIPE-IR SERIES The IR-X Battery Housing for the Trijicon Electro-Optics / IR Defense line of thermal optics is the answer to the quick battery drain of CR123 batteries, as well as the inconvenience of running wires to an external battery pack. Two different models for IR-HUNTER / REAP-IR / IR-PATROL / SNIPE-IR SERIES. The IR-X is machined from aircraft aluminum bar stock to the highest tolerances for a perfect factory fit. It has a groove that fits the factory gasket to maintain the factory waterproof integrity of the scope. The IR-X Rechargeable Battery Kit ships with a high-quality XTAR VC2 Plus Li-Ion/NiMH/NiCd USB battery charger and two high-quality KeepPower / Sanyo batteries. The XTAR charger also has a built-in USB port for safely charging your other electronic devices using the power of the batteries. Per the manufacturer, the IR-X Kit will typically run the IR-Hunter for 8-10 hours in 60hz mode. The Reap-IR / IR-Patrol / Snipe-IR will see run times of 4-6 hours. This performance is only possible by using high-quality batteries. You will see less run time in colder temperatures, as you would with any other battery.