Electrical device and program update method thereof

An electrical device, comprising:

• a housing;
• at least one adapter interface formed on a surface of the housing to detachably mount one or more battery packs to the at least one adapter interface, wherein the battery pack is operable to supply power to a hand-held, power tool or a garden tool;
• and
• a control module that programmably controls an operation process of the electrical device;
• wherein the electrical device further comprises a communication module, and the communication module comprises:
• a wireless communication module to wirelessly communicate with an external device to receive an upgrade file from the external device;
• and
• a storage module to store the upgrade file from an external device, the upgrade file comprises an upgrade program for updating a program of the control module;
• wherein the communication module is configured to receive the upgrade file from an external device through the 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 in preset condition;
• and
• wherein the electrical device is a portable power supply device, the portable power supply device further comprises an inverter module, the inverter module comprises an inverter for converting a direct current outputted by the battery pack into alternating current, and the inverter module is electrically connected to the control module and is at least partially under the control of the control module.