Abstract: A battery having two chemical cells. A positive electrode of a first cell is composed of a first catalyst which reduces ions in an electrolyte and generates gas, and a negative electrode of a second cell is composed of a second catalyst which oxidizes the gas generated by the positive electrode of the first cell and generates ions as an active material of the negative electrode of the second cell. A gas-emitting surface of the positive electrode of the first cell and a gas-absorbing surface of the negative electrode of the second cell define a sealed chamber, and the positive electrode of the first cell and the negative electrode of the second cell are electrically connected to move the ions in the electrolyte of the first cell to the second cell without mixing the electrolytes or the like in the first and second cells.