What would happen if I used a battery charger rated for 230VAC 50Hz input here in USA where we use 60 Hz? Would it be ok? What side effects may happen because of the mismatch in input frequency with the specs of the charger? Is the reaction of the magnetic core of the charger to the different frequency the only concern I should have? What might this do long term to the charger? Might it fail prematurely? I would use 230V 60Hz input on this charger by using a pair of phase locked (but reverse phase) 115V 60Hz lines so it would be a true 230V 60Hz 15A capable power source.