Streamlight 61205 Nano Light IEC-LR41 Battery, 4-Pack Pack of 4 Streamlight IEC-LR41 Batteries Provides full fresh charge for your Streamlight Nano Flashlight Waterproof construction with an unbreakable polycarbonate lens as well as pocket clip Ultra-compact at 3-1/2 inches in length Features a tailcap switch for simple one-handed operation