Question about overseas charger

I have bought this charger which I thought was UK... It seems it's US plug even if we have 220v compare to 110/20V in the US... But I was using a UK to EU adapter causing the seems to be original charger ti have a hell of slow charging and sometimes even drain if i was using tunein while charging... I wanna ask that by using a wrong adapter I'm loosing power or just that this charger sucks? Thanks




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