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In MH/Ni high power battery production, a large percent of batteries were found with an open circuit voltage lower than 1.18 V after formation, open circuit voltage of another large percent of batteries could be even as low as1.00 ～ 1.10 V after one month sitting.In this situation, we analysed the causes of the problem, and provided some efficient solution based on many experiments.It was proved that these solutions are working very well to prevent the low open circuit voltage and being used in real production.