I think the problem could be caused by the voltage constantly going below 8 volts whenever you go to idle, which is the minimum operating voltage of some gadgetry. The magneto works just like an old fashioned bicycle dynamo, so when the engine's not running there is 0 volts, and it increases linearly with revs.
It might be that some or all chargers can handle it but I've been unsucessful in finding a definitive answer on the internet so far
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