High-density batteries would make naval electric drive more flexible

How would extremely high-density batteries affect naval ships?

They would improve submarines, strengthen emergency power, and make electric drive more efficient by supplying short propulsion surges.

Batteries with gasoline-like power-to-weight density would immediately improve submarine performance. Surface ships would also gain a large reserve for emergency power after machinery damage. In an integrated electric-drive arrangement, turbines could remain near their efficient operating point while batteries supply short bursts needed for acceleration. That separation reduces the need to size every generator around the most demanding transient load. Energy storage changes both propulsion design and resilience rather than serving only as a substitute fuel.