As a lithium ion secondary battery, lithium iron phosphate battery is the main direction of power battery now, which has great advantages compared with nickel-hydrogen battery and nickel-cadmium battery. Lithium ferrous phosphate power battery has seven advantages. First, the cycle life of long-life lead-acid batteries is about 300 times, up to 500 times. The lithium iron phosphate power battery produced by Shandong Bahai Energy Group Co., Ltd. has a cycle life of more than 2000 times and a standard charging rate (5-hour rate) of 2000 times. Lead-acid batteries of the same quality only need 1- 1.5 years at most, while lithium iron phosphate batteries need 7-8 years under the same conditions. Comprehensive consideration, the cost performance will be more than four times that of lead-acid batteries.