Hi @Eric-Vanular thanks for the invite into your community!
Inherently, batteries that come out of end of life EV's have up to 80% life left in them. Unfortunately as these batteries at end of auto life are no longer suitable in the high-stress environment of an electric vehicle, automakers see them as trash that they have to pay to get rid of. This means although you may see a HUGE range decrease when driving an 8-year-old EV, once we take them out, we see up to 80% capacity still usable for less stressful applications such as utility storage.
Yes, these batteries are just being thrown away before their useful life is completed, but I would highly discourage anyone to just pick up a couple of these batteries and use them as lead acids. There are many DIY forums that show homes being burnt down without a proper management system
Our start-up is working on battery management systems that would extend the life of our batteries for 7+ years along with being able to work with batteries that come from different auto manufactures/chemistries.