Batteries for children's electric cars

Each electric motor has its own unique characteristics and requires a matching battery to operate. The battery is mainly selected based on its output voltage, which is measured in volts. The most common voltage batteries are:
6 volts;
12 volts.
There are also models of electric vehicles that operate on batteries with other voltages, for example, 24 and 32 volts. But the most widely used are 6 and 12 volts. In addition, batteries come in different types according to their chemical composition:
lead-acid;
lithium-ion (Li-ion);
helium