Back on the farm in Iowa, we had dozens of vehicles: Tractors, combines, grain trucks, work trucks, regular trucks. Each one of these vehicles requires a battery to run. Inevitably, these batteries would wear out and have to be replaced. We'd stack the bum batteries in a special corner of the machine shop. Once there were a dozen or so batteries stacked up, we'd drive into Omaha, Nebraska to sell these batteries to a refurbisher.
There might not be a place that refurbishes batteries near you, but you can still get cash or at least trade for your batteries. Don't expect a lot of cash. If you can get five dollars for a used battery, you have struck gold. Most places will only offer you a dollar or two.