In my experience, battery recycling is very hit or miss. The key for me has been to have a constant supply. On one hand, aside from a physical break, there are many different ways to revive old batteries, but most are kind of labor intensive- not to mention a little dangerous. Since I have a steady source, it is a simple matter of determining which batteries are worth trying to save and which are better off recycled. Luckily, I have found that most places will sell cores for less than the recycler pays for them, so it's always a win-win situation. Also, it is quite amazing how completely usable batteries end up being traded for new. I only have 1 new battery in my EV, and it isn't the best battery I have. The hardest part of battery recycling for me was finding places willing to sell or exchange cores.
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