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A lossless energy transfer equalizer circuit which was relatively simple and flexible was improved, aimed at the problems such as the unbalanced available capacity and the shorten service life caused by the different monomer battery performance during the latter part of lithium-ion battery pack charging. What’s more, the power lithium-ion battery pack charging balance control program was proposed based on Markov decision algorithm. Use the program to predict the direction of energy transfer to between the cells and make the optimal migration path. The analysis of the experimental results indicate that the balance efficiency and the balance results were significantly improved, and charging equalizer during the latter part of lithium-ion battery pack charging was achieved. Finally, the study proved the feasibility of the equalization circuit and balance control program.