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If it is a long-life lead-acid battery, it is generally 1.5-2 years. If it is a lithium iron phosphate power battery, the theoretical life is 7-8 years.

A battery electric vehicle (Bev) is a vehicle that is powered by rechargeable batteries (such as the lead-acid battery, nickel-cadmium battery, nickel-hydrogen battery, lithium-ion battery, and lithium iron phosphate battery). Although it has a long history of 134 years, it has been limited to certain specific applications and the market is small. The main reason is that various types of batteries generally have serious shortcomings such as high price, short service life, large size and weight, and long charging time.

Battery is the primary key to the development of electric vehicles. Automotive power batteries are difficult to meet the requirements of "low cost", "high capacity" and "high safety". Ni MH battery can store twice as much energy per unit weight as lead-acid battery, and its other performance is also better than lead-acid battery. The price of lead-acid battery is 4-5 times that of lead-acid battery. Great efforts are being made to reduce it.

Iron battery is made of iron element material with rich resources and low price, which has greatly reduced the cost and is also used by some manufacturers. Lithium is the lightest metal with very active chemical properties. The energy storage per unit weight of lithium-ion batteries is three times that of lead-acid batteries and four times that of lithium polymer batteries. Moreover, lithium resources are abundant and the price is not very expensive. It is a promising battery.

China has made rapid development in the industrial development of nickel metal hydride batteries and lithium-ion batteries. Other technologies related to electric vehicles have made great progress, such as AC induction motor and its control, rare earth permanent magnet brushless motor and its control, battery and vehicle energy management system, intelligent and fast charging technology, low resistance tire, light and low wind resistance body, braking energy recovery, etc. these technological advances have made electric vehicles more and more perfect and practical.

Here are the key points for the use of the battery: the battery should be stored after it is fully charged, taken out for discharge or used for one or two times in about a month, and then recharged to continue storage; This is conducive to extending the service life of the battery; Generally, it is better to charge the new battery for the first three times in 8-12 hours, and then in 6-8 hours; It doesn't matter if the battery is charged fast or slow; The key is discharge time; If the discharge time is long, it can continue to be used; The battery can still be used as long as it can be charged and discharged; If you buy a large domestic brand, you can; If you can identify the quality, you can also buy brand products from small and medium-sized manufacturers; This is more cost-effective; Generally, the service life of the battery is determined by the times of charging and discharging;

Generally, the battery that is repaired or renovated is charged about 50 times, so when you buy it, you are assured that the warranty is three months or half a year; Once the warranty period is over, it will not be long; The charging and discharging times of batteries produced by ordinary manufacturers are about 100-180; The service life is about one year to two years; The charging and discharging times of batteries produced by good manufacturers are about 200-300; The service life is about two to three years; The imported and original batteries can be charged and discharged for more than 500 times, and the service life will be longer; The most ideal state is to recharge the battery when it is almost exhausted. It is best; The most taboo of general battery is overcharge and over discharge; As long as these two principles are followed, the maximum service life of the battery can be used and played out.

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