AR390131 ESC LOOP CONNECT by ARRMA $6.49 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Supplied assembled and ready to use. This ARRMA ESC LOOP CONNECTOR allows the use of a 4S or 6S LiPo battery pack in your ARRMA vehicle. It should be connected to one of the ESC-to-battery T-plugs when using a single 4S or 6S battery.