USB A Female to 4.00mm x 1.70mm Female Barrel Connector Power Cable.
This power cable one end is a USB Type A female connector, another end is a female barrel connector, with 4.00mm outside diameter and 1.70mm insider diameter.
This USB adapter can plug to BX550 battery output cable to convert the barrel connector on cable to a USB A female power connector, just like this:Caution:
This USB power cable is just a cable, it does not
have any electronic circuit inside to control electronic voltage/current/polarity. Please make sure the power source output is set correctly for your device.
Overall Rating for USB A Female To 4.0x1.7mm Female Power Connector