Battery pack and electric device including battery pack

1. An electric device comprising:

an electric device body; and

a battery pack,

wherein the battery pack comprises:

a rechargeable battery;

a battery information memory unit configured to store battery type information relating to a type of the rechargeable battery, wherein the battery type information includes information relating to a material of the rechargeable battery;

a charging control unit configured to measure the number of charge/discharge cycles of the rechargeable battery and to store the number of charge/discharge cycles in the battery information memory unit; and

an information output unit configured to output the battery type information from the battery pack, wherein the information output unit is configured to output the battery type information including the number of charge/discharge cycles from the battery pack, and wherein the electric device body comprises:

a control unit configured to obtain the battery type information which is output from the information output unit; and

a residual capacity calculation unit configured to calculate a residual capacity of the rechargeable battery based on voltage capacity information,

the voltage capacity information includes a value of the residual capacity associated with

i) a battery voltage of the rechargeable battery,

ii) the type of the rechargeable battery according to the battery type information, and

iii) the number of charge/discharge cycles for the rechargeable battery,

the voltage capacity information is stored in the battery information memory unit of the battery pack or in a capacity information memory unit of the electric device body,

the voltage capacity information is stored in stages for different numbers of charge/discharge cycles and includes, for each stage of the number of charge/discharge cycles, the value of the residual capacity corresponding to both of the battery voltage and the type of the rechargeable battery, and

the electric device body further comprises a notification unit including a level meter constituted by a plurality of display segments, wherein the notification unit notifies the value of the residual capacity by changing the number of lights of the display segment.

2. The electric device according to claim 1 , wherein the battery type information includes information relating to a rated capacity of the rechargeable battery.

3. The electric device according to claim 1 , wherein the battery type information includes information relating to a manufacturer of the rechargeable battery.

4. The electric device according to claim 1 , wherein the battery type information includes the voltage capacity information.