80% of the power-wall business is expected to be industrial installations, not home installations. Big installations like that are a much better home for &quot;tired&quot; batteries - a homeowner cares about their 7kWh, a business with a 500 kWh install might not mind if 1&#x2F;3 of it was used batteries with 1&#x2F;2 max capacity.<p>And yes, Tesla&#x27;s been talking about that for more than a decade.