Kinfire Waterproof 8.4V 8800mAh 2-in-Series 4-in-Parallel 18650 Battery Pack for Headlamp - Black
Waterproof RatingI P68 Power supply for bicycle light or headlamp; 2-in-Series 4-in-Parallel; Charging time: 5~6 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 8 hours for single CREE XM-L T6 or SSC Z7 bulb; US plug charger voltage: 100~240V Electric current:1000mA?