This shows you the difference between a good quality circuit board and a low quality one. Usually the blue and green ones are better quality and the bright garish circuit boards are low quality.
You can see the battery in the picture below. It has a white label on it, and if you read it carefully, it will give all the specifications and also the brand of the battery. This hoverboard has a Samsung battery. The hoverboards have a lithium-ion battery of around 37 volts. They are big batteries, but just to bring it to scale, a Tesla S vehicle has a lithium-ion battery of 375 volts.
This hoverboard has a low quality Chinese battery, and the text on the label is Chinese.
This is what a genuine Samsung battery looks like.
The motors of the hoverboard are inside the wheels. Here you can see the motor inside the hoverboard wheel.
The foot boards control the speed and direction of rotation of the wheels.
The main chassis of the hoverboard is formed by two solid metal pieces joined by a rotating shaft. It is the heaviest part of the hoverboard.
This video shows a hoverboard being taken apart.
This video explains how the foot pads control the speed and direction in which the wheels rotate.
For more on hoverboards have a look at one of these sections: