The advantage of lithium batteries is that they are lightweight: for example, a 36-volt 10-Ah lithium battery weighs 5 kilograms, and a lead-acid battery with the same voltage capacity weighs 10 kilograms. Secondly, lithium batteries have a long life and can be used for 4-5 years, while lead-acid batteries can be used for 2-3 years. The disadvantage is that it is expensive: lithium batteries with the same voltage capacity are twice as expensive as lead-acid batteries. If your electric car has a 48-volt 12-amp-hour lead-acid battery, it will cost about 400 yuan, and a lithium battery will cost about 1,200 yuan.