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  2. Tesla Powerwall - Wikipedia

    en.wikipedia.org/wiki/Tesla_Powerwall

    The Powerwall 1 battery uses nickel-manganese-cobalt chemistry [31] and can be cycled 5,000 times before warranty expiration. [ 31 ] [ 32 ] The Powerwall has a 92.5% round-trip efficiency when charged or discharged by a 400–450 V system at 2 kW with a temperature of 77 °F (25 °C) when the product is brand new. [ 14 ]

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