Right.
I have a bank of four L16 deep-cycle lead acid batteries for my home backup system, that's 8.4 kWh. The first set lasted me 9-1/2 years. Replacing those batteries costs around $1200. On a per kWh basis, that old tech costs less than half. Also, lead-acid batteries tend not to have thermal run-away problems.
I'm also not sure how the heck Elon expects not to go broke with a 10 year warranty on Li-ion battery packs. They're typically good for a few hundred to maybe a thousand cycles, and they lose capacity every year even if they're not cycled at all. Unlike lead-acid batteries, they don't like to sit around fully charged; optimal storage is more like a 40-50% SOC.
I have a bank of four L16 deep-cycle lead acid batteries for my home backup system, that's 8.4 kWh. The first set lasted me 9-1/2 years. Replacing those batteries costs around $1200. On a per kWh basis, that old tech costs less than half. Also, lead-acid batteries tend not to have thermal run-away problems.
I'm also not sure how the heck Elon expects not to go broke with a 10 year warranty on Li-ion battery packs. They're typically good for a few hundred to maybe a thousand cycles, and they lose capacity every year even if they're not cycled at all. Unlike lead-acid batteries, they don't like to sit around fully charged; optimal storage is more like a 40-50% SOC.