Portable electric work machine, and battery pack

A portable electric work machine, comprising:

• a battery pack that comprises a first memory that is a memory accessible from a battery and an outside;
• and
• a work-machine main body configured to be allowed to operate with power being supplied from the battery when the battery pack is mounted,
• wherein the work-machine main body comprises:
• a work unit for a predetermined operation driven by the power from the battery;
• and
• a controller configured to control the work unit,
• a second memory that is a memory accessible from the controller, and
• when information related to a purchase date or a sale date is not stored in the second memory, the controller writes, in the second memory, the information related to the purchase date or the sale date according to information stored in the first memory.

A battery pack, comprising:

• a cover member;
• a battery accommodated in the cover member;
• and
• a memory that is accommodated in the cover member and is configured to store information related to a purchase date and a sale date,
• wherein the memory is accessible from an outside of the cover member via a predetermined interface.

A portable electric work machine, comprising:

• a battery pack that comprises a battery, and a first memory that is a memory configured to store predetermined information;
• and
• a work-machine main body configured to be allowed to operate with power being supplied from the battery when the battery pack is mounted,
• wherein the work-machine main body comprises:
• a work unit for a predetermined operation driven by the power from the battery;
• a controller configured to control the work unit;
• and
• a second memory that is a memory configured to store information related to an operation record of the work unit, and
• with the battery pack being mounted on the work-machine main body, information corresponding to information related to the operation record of the work unit stored in the second memory is written in the first memory.

A battery pack for supplying power to a work-machine main body that includes a work unit, comprising:

• a cover member;
• a battery accommodated in the cover member;
• a controller that is accommodated in the cover member and is configured to control the battery;
• and
• a memory that is accommodated in the cover member and is configured to store information related to a purchase date and a sale date,
• wherein the memory includes a region for storing information indicating a result of using the battery, and a region for storing information indicating an operation result of the work unit.

A method comprising:

• reading the information stored in the memory from a battery pack for supplying power to a work-machine main body that includes a work unit, comprising:
• a cover member;
• a battery accommodated in the cover member;
• a controller that is accommodated in the cover member and is configured to control the battery;
• and a memory that is accommodated in the cover member and is configured to store information related to a purchase date and a sale date, wherein the memory includes a region for storing information indicating a result of using the battery, and a region for storing information indicating an operation result of the work unit;
• and
• causing a predetermined display device to display the result of using the battery, or the operation result of the work unit, according to the information read from the memory of the battery pack.