Trade it in
I trade my old batteries in at the local battery store, I think I get $2 for a standard size battery $3 for a tractor size.
I looked into this a few years ago and determined that there was no safe way for the home user to reclaim the lead out of it.
NRA Lifetime Member Since 1999
"I ask, sir, what is the militia? It is the whole people except for a few public officials." George Mason