First of all, there are five main types of lithium batteries for automobiles:
1. Nickel-cadmium battery-1.2V voltage, strong overcharge resistance, but because the voltage is relatively low, the life span is not very long.

2. Ni-MH battery-voltage 1.2V, currently the longest life of car batteries, but the voltage is still relatively low.

3. Lithium-ion battery-voltage 3.6V, weight is about 40% lighter than nickel-hydrogen battery, but its capacity is 60% or more higher than nickel-hydrogen battery, life is equivalent to nickel-cadmium battery, but it is not resistant to overcharge, and the temperature is too high It is easy to cause the structure to be destroyed and spontaneously combust or explode. It is also the most widely used battery for new energy vehicles.

4. Lithium polymer battery-voltage 3.7V, an improved type of lithium ion battery, which is more stable than the former, and is currently the highest technology of lithium batteries among commonly used new energy vehicles.

5. Lead-acid battery-voltage 2.0V, a common battery for car batteries, with a long service life, large size and weight.

As power, high-voltage lithium batteries, namely lithium-ion batteries or lithium polymer batteries, are usually used. Regardless of the type of lithium battery, it has the characteristic of being unable to withstand charging, that is, poor stability, which is the problem.