A battery (1) comprises a chargeable and dischargeable battery cell (23)； a first electrode (21) and a second electrode (22) connected to the battery cell and electrically connected to an external electrode in a non-contact state； a switching circuit (24) which is provided in a battery circuit comprising the battery cell, the first electrode and the second electrode, and switches the current flowing in the battery circuit to alternating current or direct current； and an insulating housing (10) which houses the battery cell, the first electrode, the second electrode and the switching circuit therein.
