Battery manager

A battery manager for managing power of a battery, comprising:

• a power display device configured to display a current power level of the battery;
• a charging circuit configured to charge the battery;
• an operation input device configured to receive a user input signal and generate a trigger signal;
• a switch circuit connected to the operation input device;
• and
• a controller connected to the switch circuit, the power display device, and the charging circuit, wherein
• the controller is connected to the battery through the switch circuit for the battery to supply power to the controller through the switch circuit;
• the controller is connected to an external power source for the controller to receive power from the external power source;
• the controller is configured to obtain the current power level of the battery and control the power display device to display the current power level of the battery;
• the controller is configured to control the charging circuit to charge the battery;
• the controller is configured to control the switch circuit to connect or disconnect the battery and the controller;
• in response to the operation input device generating the trigger signal to the switch circuit, the switch circuit connects the battery and the controller, the battery supplies power to the controller, the controller controls the switch circuit to maintain a connected state to avoid the switch circuit from being affected by the operation input device;
• and
• in response to the switch circuit connecting the battery and the controller, the controller performs power management on the battery, the power management including one or more of displaying the current power level of the battery or charging the battery.