Earliest viable modern battery

I'm building a world where high-density, low cost batteries are discovered far, far in advance of modern times, leading to a decentralised power grid. It has become convention for homes and buildings to be build with inbuilt batteries, and energy is supplied by town-to-town vendors. My question is:

• What is the best form of modern battery tech that could feasibly have been discovered before the Industrial Revolution?
• If different to the above, what is the cheapest to produce?
• If none exist, what's the earliest humanity could have mass produced kilowatt scale batteries?

posted about 5 years ago

Ucinorn‭

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