This is a TQ Wire 450mm 4S ThunderPower Balance Extension. TQ Balance "charger specific" multi-extension cables use TQ's flexible triple black 22 gauge cable material to relocate the balance plugs, making it easier to balance charge a battery without removing it from your car. These cables are made to plug directly into the balance port of your charger. One end has your charger specific plug and the other end has both an XH connector (ProTek, SMC, Orion type) and a ThunderPower connector. These are 450mm in length and plug directly into the charger and eliminate the balance board.
NOTE: When using the 2203 TP balance extension cable with the TP820CD charger make sure the connector on the cable is shifted to the left side of the charger's balance port. The cable was designed to fit the TP610C that has a shorter port.