Since the chemical characteristics of lead-acid batteries are stable, they can move up and down with the car and can adapt to hot summers and cold winters. They are not subject to dangers, such as sudden explosion, corrosion leakage, etc. spontaneous combustion, etc., which rarely occur and the cost is low.
Lithium batteries can only be used in very small cars, and electric motorcycles are afraid to use them. Firstly, they are expensive, and secondly, their chemical properties are not so stable and it is not easy to use. Process them into large pieces, overloading can pose a danger when exposed to heat.
When a new battery is developed, the huge research and development costs will not be passed on to consumers. If the state does not support it, the price will be unacceptable.