Abstract: According to one embodiment, a battery includes an electrode group, a container, a lid, a pair of electrode terminals, electrode group holder. The electrode group is housed in the container, and the lid covers an opening of the container. The lid includes a gas discharge valve, a liquid inlet is formed in the lid. The electrode terminals are attached to an outer surface of the lid. The electrode group holder is provided between the lid and the electrode group inside the container, and stacked together with the lid. An open hole penetrating through the electrode group holder is formed across an area facing the gas discharge valve and an area facing the liquid inlet.