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LiFePO4 battery is considered to be an important component for making future transportation more energy-efficient and less dependent on petroleum through hybrid, plug-in hybrid, electric, or fuel cell vehicles. This paper focuses on the impacts of ambient temperate on the cycle life of LiFePO4 battery. The experimental procedures for batteries are developed, and a test plan on the cycle of charge and discharge with the current of 1C is made. Lower or higher test temperature is divided with a step length of 10°C. At each temperature, the discharge capacity and impedance are measured every 20 cycles. After 100 cycles testing, the discharge capacity and impedance curves are plotted. With the help of the curves, this paper analyzes the influence of temperature on discharge capacity and impedance. Finally, some suggestions about how temperature influences battery cycle life are presented. [ABSTRACT FROM PUBLISHER]