Nitecore NBP68HD Li-Ion Rechargeable Battery Pack for Nitecore TM38, TM28, TM15, TM26, TM36 Flashlights (8 x 18650)Nitecore NBP68HD battery pack is designed for the Tiny Monster TM28 and compatible with other flashlights in Tiny Monster series such as the TM15, TM26 or TM36. This impressive battery pack has the power of eight 18650 batteries, doubling the run time of your light. Features: Double TM series flashlight run time with 8 built in 3400mAh 18650 batteries. Two ways to charge: charge through flashlight, charge by itself using TM15, TM26 or TM36 A C power