Specifications of the Li-ion Battery Universal EU Charger 18650 Double Battery 3.7v Rechargeable Battery Charger: Brand: generic or unbranded 18650 Single Charger model First input: AC (100-240V) 47-63 Hz DC 3.7V to 450mA output Composition: Polymer Final Charge 4.2V +1% and 4.2V-1% are the voltages. 40g in weight (g) Black is the color. Type of plug: