Patent ID: 8680811

Claim:
An electronic device that employs a secondary battery, which is rechargeable by a charger, as a power source and is capable of conducting a proximity noncontact communication with the charger, the electronic device comprising: a power receiving coil that receives an electric power from the charger; an antenna used for conducting the proximity noncontact communication; and wherein the secondary battery is charged with the received electric power; and wherein the electronic device executes: a first charging process of charging the secondary battery, then a first communicating process of conducting the proximity noncontact communication for a first variable communication time, then a second charging process of charging the secondary battery, and then a second communicating process of conducting the proximity noncontact communication for a second variable communication time; and wherein the first variable communication time is a first predetermined communication period when a voltage of the secondary battery is equal to or greater than a predetermined communication value, and is a second predetermined communication period which is shorter than the first predetermined communication period when the voltage of the secondary battery is smaller than the predetermined communication value, and wherein the second variable communication time is a third predetermined communication period when a voltage of the secondary battery is equal to or greater than the predetermined communication value, and is a fourth predetermined communication period which is shorter than the third predetermined communication period when the voltage of the secondary battery is smaller than the predetermined communication value.