If this is true it will be a manufacturing masterpiece as the existing batteries by their own function start to break down from the moment they are put into operation and normal car batteries last about 4 years.
In "perfect" conditions with top quality vented NC batteries they can last up to 20 years but perfect conditions do not exist in real life and the cost increases to produce those perfect conditions so that a "normal " system needs at least 10 years to pay for itself but a perfect system will take even longer to reach that point.
