US Patent 11029941 Electrical device and program update method thereof

An electrical device includes a housing, at least one adapter interface to enable one or more battery packs to be detachably mounted to the electrical device, a control module, and a communication module including a wireless communication module and a storage module. The storage module is used for storing an upgrade file from an external device. The upgrade file includes an upgrade program to update the program of the control module. The communication module is configured to receive the upgrade file from the external device through a wireless communication module, store the upgrade file in the storage module, and send the upgrade file to the control module to update the program of the control module if preset conditions are met.