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Batteries Inside Out - The Royal Institution (march 2019)

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side note:
Batteries are not well understood. There are no theories to predict battery performance.
Therefore:
All improvements happen thru trial and error experimentation.

This means Li -Ion battery improvements are historically limited 5 % to 20% /year.
Or 7%/year => 100%/decade .

Other threads in this battery forum explain in more detail. check them out