Has anyone used an Oral-B power toothbrush (7000 or 8000 series)? I have one and it uses normal 110V power to charge Ni-MH battery. The interesting thing is its charger interface. The charger base has a protruder and the toothbrush has a corresponding receptacle, which match each other for charging. However, both the protruder and the receptacle are made of plastic material, i.e. non-conductor. I measured them using my multimeter and it shows no voltage, no current and infinite resistance, confirming that they are indeed non-conductors. So the questions is, how is charging done with non-conducting interface?
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