1. Safety comparison

　　The safety of power lithium-ion battery (lithium manganate, lithium iron phosphate) materials is different. The skills of lead-acid battery have been properly mature, and the safety is better than that of lithium-ion battery.

　　2. Environment comparison

　　Lithium ion batteries are not polluted, while lead-acid batteries are polluted by heavy metal lead. Therefore, electric vehicles using lead-acid batteries are still polluting the environment.

　　3. Price comparison

　　The price of lithium ion batteries with the same capacity is more than twice that of lead-acid batteries on the market. This is why lithium-ion battery electric vehicles are more expensive.

　　4. Energy comparison

　　The mass ratio, volume ratio and energy ratio of lithium ion battery are about 40% higher than those of lead-acid battery.

　　5. Comparison of self discharge rate

　　The monthly self discharge of lithium ion battery is less than 3%, and that of lead-acid battery is 15-30%.

　　6. Comparison of service life

　　Now, lithium iron phosphate for general use has been charged for 1500 times without recall effect. After 1500 times of charging, it has about 85% storage capacity, while lead-acid battery has been charged for about 500 times, its storage capacity will be significantly reduced, and the recall effect will be significant. As a result, electric vehicles with lithium-ion batteries have a longer life span.

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