Nitecore NBP68 Li-Ion Rechargeable Battery PackNot getting enough runtime from your Nitecore TM Series flashlight? Maximize the usage of your flashlight with the NBP68 Lithium-Ion Rechargeable Battery Pack by Nitecore - the most potent TM Series battery pack available! This impressive power source is compatible with a number of Nitecore's most powerful tactical flashlights and is able to be recharged separately or while attached to the flashlight for up to 500 charge-discharge cycles. The battery's Lithium-Ion composition allows it to hold a substantial amount of power, up to 98 Watt-hours, giving you more usage per charge cycle. The pack can be charged via its 3.5mm port, taking roughly 14 hours, or through its 4.5mm port, taking approximately 7 hours to fully charge. The NBP68 even features a blue charging status indicator, which blinks 5 times every second to indicate it is charging and blinks once every 0.7 seconds to indicate it has reached 98% capacity. Once you experience the power of the NBP68, you'll wonder how you ever used your Nitecore flashlight without it!Features Functional with the following models: TM15, TM26, TM26GT, TM36, TM36-LITE Able to store up to 98 Watt-hours of power Blue Status Indicator shows that the battery pack is charging and when charging is almost complete CE and RoHS Certified Dimensions: 6" (Length) x 1.875" (Diameter) Weight: 1 lb. 5 oz.