The invention relates to a submarine provided with lithium-ion battery power storage means that are in the form of related individual storage elements (2, 3, 4), each element (2, 3, 4) being provided with an electronic extender card (5, 6, 7) which manages the operation of said element, wherein: the related individual storage elements (2, 3, 4) are arranged in a row; each electronic card (5, 6, 7) of an element in a row (1) is mechanically and electrically connected by the ends (8, 9) thereof to the electronic cards (5, 6, 7) in the row (1) that are most adjacent thereto, in order to form a strip of cards (1a) for this row (1), and said strip of cards (1a) can be controlled by an operator from at least one of the ends thereof and is capable of sliding relative to the storage elements (2, 3, 4) of the row (1).