Patent ID: 8421405

Claim:
A charge system comprising: a secondary battery attachably and detachably installed; a mobile electronic device to which electric power is supplied by the secondary battery; and a charging device charging the secondary battery via the mobile electronic device, wherein the secondary battery comprises: a battery cell accumulating electric power; an electrode connected to the battery cell; and non-contact output means capable of outputting specific information by magnetic field communication, wherein the mobile electronic device comprises: a battery terminal transferring electric power with the electrode of the secondary battery; non-contact means for extracting information that performs magnetic field communication with the non-contact output means; and a control means that acquires the specific information outputted by the non-contact means for extracting information and controls charging of the secondary battery based on the acquired specific information while the charging device is connected with the mobile electronic device, wherein the non-contact means for extracting information has a loop antenna for performing transmission and reception of signals through electromagnetic waves, and wherein the loop antenna is placed within the battery terminal, the electrode is fixed at an end portion of the battery cell, and the non-contact output means is fixed at the end portion of the battery cell at which the electrode is fixed.