Ok, I’ve looked at the source provided and don’t see an e-mail field either. The account e-mail is also limited to your own instance, correct? This thread was making me mildly concerned that e-mails were being shared when federating between instances.
I wouldn’t call it the unused state, but when recycled in a proper facility, the material recovered from lithium ion batteries can be used again in future battery production. Related: https://www.youtube.com/watch?v=s2xrarUWVRQ&t=270s