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A very big, very wide wheel, in fact. The Mega-Wheelie houses a 24V LiFePO4 battery pack, 450 W gearmotor with chain and sprocket drive, SyRen motor controller from Dimension Engineering ...
The device is a secondary (rechargeable) battery pack with an average voltage of 25.6V and a rated capacity of 20Ah. Up to two batteries can be connected in series to produce 48V, and up to ten units ...