I dont know whats wrong with it, but in a circuit that used to work fine, now when I plug the link in, there are no lights and the wires connected to the battery burn up instantly. This has happened in 4 different circuits, with batteries ranging from 18v to 7.4v, even on the simplist circuit. Ive no idea whats happened to it, but my last robot went up in smoke and its done the same thing each time since then.

Gary, its just 2 drill motors Im driving, 7.2v. ones