I called the local salvage yard not big, but I know the guy. He told me that they wear paying $25.00 fore the bigger tractor /18 Wheeler battery's full of acid or not. The core charge is only $6.00 you could take the hit and make $19.00 a battery. If the lead is worth that much in a dirty condition. That could be a indication of prices to come. I was once told that a average car battery has 28 to 35# of lead in them. But how do you get it out!! I know most bullet casters don't go through much lead but one golf ball weighs 1# so a 5gal bucket of WW makes about 75 rounds.