Agreed. One of the reasons Li-ion (Lithium Cobalt Oxide) batteries are so expensive is the extensive quality controls that have to be performed on it. If you put 100 cells in a car and even 1% of those cells are faulty, your car catches fire. The worst that happens with LiFePO4 is the internal goo bubbles out of the battery and smells bad.<p>AFAICT, Tesla uses Lithium Nickel Cobalt Aluminum Oxide (LiNiCoAlO2) aka &quot;NCA&quot;. It&#x27;s safer than Cobalt, but not as safe as Iron.