New bike help needed

[ReVolter]

I agree make your own power adapter super easy. I like the model below from Amazon, its UL listed

Journeyman-Pro 2713 30 Amp, 125/250 Volt, NEMA L14-30R, 3P, 4W, Locking Plug Connector, $15.97​

Tripp Lite Heavy Duty Computer Power Cord, 15A, 14AWG (NEMA 5-15P to IEC-320-C13), 3-ft. $8.52​

3 amps is 3 amps, you are conflating WATTS with amps. Volts = Watts/Amps. if your pulling 12A while slow charging you have a bad power plug, or high resistance

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It's not that simple. The charger uses a boost converter to charge the battery at 450V and 3A for slow charging, this works out to around 12A of 110V current.

 

[MadpdXabbott]

I agree, I see the error in my way. That's why the 120 is slow. but the Max for the charger is 420V and our battery pulls around 330v at a 10amp Max output, and 16amp input.
Charger