Abstract: Base failure rate model and operating failure rate model were developed to predict the reliability of the lithium-ion batteries. Firstly, the mostly failure models of lithium-ion batteries were analysised, and the operating current and temperature were regarded as the main accelerating factors of the failure of lithium-ion batteries. Secondly, consulting the GJB/Z299 , the life-testing data was used to calculating the numerical values of the parameters of the models, and to buid the adjusting coefficient(π-coefficient)project. By using the models, the predicting failure values under different operating currents and temperatures were calculated. The predicting failure values were then compared with the life-testing values. The results indicate that the base failure rate model and operating failure rate model are feasible for engineering practise.