8.4V 6400mAh Rechargeable Li-ion Battery Pack with a Special Protection PouchInterface: DC5.5*2.5 for most CREE XML-T6 LED or SSC-P7 Head Lamp / Bike LampPouch with Velcro can be tied on waist belt or bicycle handlebar6400mAh large capacity for long time use100% Brand newHigh qualitySuitable for CREE XML-T6 LED or SSC P7 Head Lamp / Bike LampBattery capacity: 6400mAhVoltage: 8.4VUse time: 3-4 hoursCharging time: 4-5 hoursContains:1x Rechargeable Li-ion Battery Pack1x Protection Pouch