A lawn mower is a machine utilizing one or more revolving blades to cut a grass surface to an even height. In this case it is an upgraded version of a lawn mower with a power bank, rotation speed regulating unit, etc.
In case if you can’t buy all of that, you just could make the same lawn mower with a speed rotation regulating unit and a power bank. You need to find a motor and a power supply unit
The height of the cut grass may be fixed by the design of the mower, but generally is adjustable by the operator, typically by a single master lever, or by a lever or nut and bolt on each of the machine’s wheels.
The blades may be powered by muscle, with wheels mechanically connected to the cutting blades so that when the mower is pushed forward, the blades spin, or the machine may have a battery-powered or plug-in electric motor.(wikipedia)