Features:10400mah bicycle headlight battery pack, waterproof, large capacity, you can quickly charge. Bundle binding installation, convenient & firm. Thick non-slip mat, not easily displaced. No battery momery effect Stable operation: Life cycle up to 1000 times Package included:1x 10400 Mah Power Pack Specifications: Brand XANESColor Black Battery Type Lithium battery Weight 242g Size 15*6*2.5cm Capacity 10400 Mah Voltage 8.4 V Charging method Charger Charging time About 4h Watterproof Yes