A battery includes a unit cell, which includes an electrode layer and a counter electrode layer facing the electrode layer, an electrode current collector in contact with the electrode layer, a counter electrode current collector in contact with the counter electrode layer, and a seal between the electrode current collector and the counter electrode current collector. The unit cell is disposed between the electrode current collector and the counter electrode current collector. At least one selected from the group consisting of the electrode current collector and the counter electrode current collector has at least one recess facing the seal.