Abstract: A battery is detachably mounted on an unmanned aerial vehicle by using at least one attachment mechanism. The battery monitoring method includes: detecting, by the battery, before the unmanned aerial vehicle takes off, whether the at least one attachment mechanism is in place; and sending, by the battery, a first signal to the flight control system in response to detecting that the at least one attachment mechanism is in place, wherein the first signal is configured to instruct the flight control system to initiate takeoff of the unmanned aerial vehicle; or sending, by the battery, a second signal to the flight control system in response to detecting that at least one of the at least one attachment mechanism is not in place, wherein the second signal is configured to instruct the flight control system to prevent takeoff of the unmanned aerial vehicle.