Waterproof 8.4V 5400mAh Rechargeable 2-in-Series 3-in-Parallel Li-ion 18650 Battery Pack
Power supply for bicycle light or headlamp Charging time: 4~5 hours; Universal for Cree XM-L T6 / L2 / U2 / Z7 / R5 bulb headlight or bicycle light; Provide high mode light 4.5~5 hours for 3 x CREE XM-L T6 and high mode light 7 hours for single CREE XM-L T6 or SSC Z7 bulb