The number of batteries in a 40-foot energy storage cabinet varies depending on the battery type, design, and energy capacity. . Common configurations can include systems with anywhere from a few batteries to hundreds or even thousands, 3. Inside the cabinet, batteries are connected in a way that allows them to deliver. . A battery rack cabinet is a specialized enclosure designed to securely house multiple batteries in energy storage systems. It ensures thermal management, safety, and scalability for industries like telecom, data centers, and renewable energy.