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> Despite Tesla claiming that the Tesla Powerwall cost would drop by half in the next three years, we’ve seen the price of the Powerwall increase twice to its current price, $12,000, since that announcement in September 2020
https://www.solarreviews.com/blog/is-the-tesla-powerwall-the-best-solar-battery-available
(it came with 11 to 14 kWh increase in capacity but it's merely 27%)