1.8.4V battery pack, 4400mAh 2. 4pcs 18650 li-thium battery 3.Lithium ion 18650 Battery Pack for Bike lights Specifications:1. 18650 Rechargeable Li-lion Battery Pack with protective circuit boar2. Capability: 4400mAh3. Voltage: 8.4V-12V4. Working time: Continuous work more than 3 hours in high bright mode, morethan 30 hours in weak bright mode.5. Battery lifespan: Can be charged 500-800 times6. ...