They don't advertise the wattage of the heating element. At least I couldn't find that on their website.
I could not find it either and they do not list a time to boil the water. I think that is kind of suspisious.
The original mug discussed in this thread advertises a separate 5v LiIon battery to power it. If the mug's heating element is, say, a measly 100 watts, lordy lordy, that would require 20 amps!
Actually they do not. The USB output has 5 V (which is USB spec). Nominal voltages of LiIon batteries are multiples of 3.7 V. The ratio between battery capacity and Watt hour rating for the battery that comes with the mug indicates a single cell LiIon battery (which would be a nominal 3.7V). Typically an optimum discharge current would be at about 3 A and a high current while maintaining medium battery life at about 10 A. 10 h battery life (presumeably for keeping it warm) do not indicate a great insulation.
I would not buy this mug.
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