METHOD, DEVICE AND SYSTEM FOR SUPPLYING POWER FROM STORAGE BATTERY

Embodiments of the present invention disclose a method, a device, and a system for supplying power from batteries. The method for supplying power from batteries includes: detecting a power supply state of a cycling battery in a system, where the system firstly uses the cycling battery to supply power to a load; and when a voltage of the cycling battery drops to a voltage threshold, activating a standby battery to supply power to the load. The embodiments of the present invention can implement mixed use of different types of batteries.