The present disclosure provides a smart battery, such as a smart battery 60 shown in FIG. 6. As shown in FIG. 6, the smart battery includes one or more energy storage units 61 (only one of the energy storage units 61 being shown in FIG. 6) and a control circuit 62. The energy storage unit 61 is used to store electrical energy. The control circuit 62 is electrically coupled to the energy storage unit 61. The energy storage unit 61 provides power to external objects through the control circuit 62. The control circuit 62 is configured to choose a corresponding discharge protection parameter according to a present status parameter of the energy storage unit 61 to perform discharge protection operation on the battery using the chosen discharge protection parameter. In some embodiments, different status parameter ranges correspond to different discharge protection parameters.

In some embodiments, the energy storage unit 61 may include a battery core.

In some embodiments, the status parameter may include at least one of a discharge electrical current, a temperature, an internal resistance, the number of times of discharge, or SOH of the battery core of the battery.

In some embodiments, the discharge protection parameter may include at least one of a discharge cut-off voltage or a longest sustainable time duration for the battery being discharged at the discharge cut-off voltage. In some embodiments, the longest sustainable time duration may be inversely proportional to the discharge cut-off voltage.