Bicycle headlights 18650 battery pack ,3.7V 8A smart speaker lithium battery Voltage:3.7V Capacity:8000mAh Dimension:18*55*70mm Charging current:7A Protection function: Overcharge, over discharge, over current, short circuit, etc Connector and wires:Can be customized according to requirements Fit for:Bicycle headlights,Photographic equipment, electric sprayer, medical beauty instrument, solar integrated street lamp, medical instrument, etc