Evinrude’s battery ignition racing motors ran on a 6 or 7- 1/2 volt Hot Shot battery. Of course you do have to remember to shut off the power when the motor isn’t running. If the points happen to be closed when at rest, it will run down the battery and overheat the coil. This is no problem with the Elto as the points only momentarily snap shut when the motor is running. Steve Woods runs his Elto’s on a length of PVC pipe with 4 “D” cells in it – it puts out 6 volts and goes many hours of running time over a week end. ., .
