The power source: two 18650, 4400mAh, 4.2V batteries with two parallel connection. 1.1 Sheath Materials Aero aluminum alloys CNC treating Surface anode under oxidation treatment1.2 Oxidation Color Titanium black1.3 DimensionLength 61 mm× Diameter 40mm1.4 Power source The power source consists of two18650, 4400mAh, 4.2V batteries with two parallel connection. Generally, it can work continuously 2 ...