This advance civilization would probably be still using lead acid or alkaline since there is no incentive to do further. They would even be surprised at us putting lithium in our devices.
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They could also have wireless power or just very good tiny generators.
Why use a battery when you can just have tiny fusion reactors in every house/ship that broadcasts power for all your needs.
Like them pylons in star craft
We’re their battery technology
Yeah I saw that movie.
Did you just take both pills?!
Corrected my wrong grammar hopefully that makes you happy.
