If you have purchased the charger, the size of DC will be sent to: 5.5 * 2.1 by default.

For other requirements, please contact customer service for customization.

Product description:

Nominal capacity: 4000mAh 

Product size: 19*37*66mm

Voltage: 3.7 V

recommended charge current:2A

Standard weight: about  90g

The battery pack is widely used in headlights, miner's lamp, flashlight, searchlight, loudspeaker (loudspeaker), wireless monitoring equipment, medical equipment, instrumentation, traffic signs, portable small appliances

USB charger included