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Li/SOCl₂ battery with maintenance-free, high energy, long storage life and other advantages, so it has been widely used in the field of national defense as the representative of the national economy at present. But the Li/SOCl₂ battery storage life assessment is still a problem in the industry. Through extensive, in-depth research and Li/SOCl₂ batteries pre-storage data collection, the factors influencing the storage life of Li/SOCl₂ battery and the evaluation methods were studied. Through research, Li/SOCl₂ battery storage life test should prepare samples as soon as possible, accelerated test method may be used if time is pressing. A method of evaluating the battery storage life and its storage reliability by equivalent storage times is proposed, when the equivalent storage time is not sufficient, the sample should be arranged for capacity regression analysis in order to obtain its degradation law. In addition, the performance and thermal effect of the battery should be analysed in the end of storage. On the basis of the above work, the battery storage life is comprehensively evaluated. Finally, engineering calculation is carried out by case analysis,which provided a reference for the subsequent Li/SOCl₂ battery storage life evaluation.