Subs.... You are talking on another level. Whatever the Military has done, and not just through Alien Technology, which I know a smattering about, will never get into Public EV Companies or others! Everything is closed doors so to speak!
One example is the Water purification systems, where the Navy had such systems aboard the Aircraft Carriers & other ships! While California is dying of thirst and has Oceans of water to desalinize, the military kept their Desal'-secrets to themselves!
Then to believe that Aliens would have lithium-Ion Batteries of even better systems, is not even worth talking about! Highly advanced civilizations have systems 1,000s of years in advanced of ours, and even if they knew about Lithium-ion batteries, do you really think they would give them to Humans? And they have no value in the "Almighty" Dollar as well, so paying for them would have to come in another form if that was even a high priority item to talk about, which it isn't! Humans are doing quite well in the development of EV car Batteries, so we really don't need help from outside!
EV Batteries are somewhat unstable, that's all I have to say, and that Fuel Cells might be a better alternative to arrive at Electrons, which will then drive the back wheel motors! L-I Batteries can be over-loaded, overheated and prone to fires, so Fuel Cells are here to solve that problem, hopefully at least! GLTA...
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