GPS positioning: most people are familiar with GPS, Beidou, GLONASS and other navigation systems. Except that secondary rechargeable batteries are widely used at home and abroad, primary lithium batteries also play an extremely important role in the navigation and positioning field dominated by these systems. Compared with rechargeable batteries, the primary lithium battery has high capacity, low self discharge rate and wide temperature adaptation range. Therefore, when the primary lithium battery is equipped on the navigation equipment as the working or backup power supply, the navigation and positioning system can work normally and stably without being on duty outdoors for a long time.