Lithium Ion submarine batteries, just seems like a bad idea from the get go.
I’ve seen what they can do to a cell phone. I can only imaging what they’d do in a submarine.
So how many AA batteries does it take to power a submarine?
The Japanese have the best conventional subs in the world, but snorkeling while recharging batteries is revolutionary?
The Kriegsmarine might want to discuss that with the Japanese MSDF.