Abstract: A kind of energy-storage power supply using high power lithium iron phosphate batteries with good safety characteristics as energy storing elements was developed for mobile platforms. This kind of power supply has high performance battery sampling and equalizer modules as well as charging/discharging management system, which enhance its reliability and prolong its life. During the development process, a large number of engineering experiments and tests were conducted to assess its transportation safety, environmental adaptability, maintainability and reliability. As a result, the reliability of the energy storage power supply system has been verified after more than 12 months’ running of 21 energy storage power supplies in high temperature areas where the temperature exceeded 55 ℃.