Trolling Motor powered by lithium ion 18650's?

[BrianG]

I don't think so, not without some serious modding. Typical AM/FM receivers simply modulate the needed 1ms-2ms pulses onto the transmitting frequency, it is highly unlikely that unit uses the same method. I think it would be easier to take the output from that unit's (the one pictured) receiver and convert that instead, but still not a simple task.