I'm watching a potential real game changer called the Liquid Metal Battery. Invented 10 years ago by MIT chemistry prof. Don Sadoway and his company Ambri is currently in beta testing. Check out his TED talk on Youtube. You want a dirt cheap battery? Make it out of dirt.
I have also watched and read all I could concerning Sadoway's battery. I just don't know if they will ever develop a commercial grade product that people can afford.
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