Battery

A battery comprising:

• a first power generating element including a first electrode layer and a first counter electrode layer;
• a second power generating element including a second electrode layer and a second counter electrode layer;
• a third power generating element including a third electrode layer and a third counter electrode layer;
• a first current collector that is in contact with the first electrode layer;
• a second current collector that is electrically connected to the first counter electrode layer;
• a third current collector that is electrically connected to the second current collector and in contact with the third electrode layer;
• a fourth current collector that is in contact with the third counter electrode layer;
• a first sealing portion that seals a first gap between the first current collector and the second current collector;
• a second sealing portion that seals a second gap between the second current collector and the third current collector;
• a third sealing portion that seals a third gap between the third current collector and the fourth current collector;
• a first void disposed between the first sealing portion and the first power generating element;
• a second void disposed between the second sealing portion and the second power generating element;
• a third void disposed between the third sealing portion and the third power generating element;
• a first gas detection unit that detects a first gas;
• a second gas detection unit that detects a second gas;
• and
• a third gas detection unit that detects a third gas,
• wherein the first gas detection unit detects the first gas in the first void, and
• the second gas detection unit detects the second gas in the second void,
• the third gas detection unit detects the third gas in the third void.