Can I bring an old lawn tractor battery and drop it off? I bought a new one from Wal Mart on 20 but don't have a receipt now.

If you bought it off a card they can look it up

Yes

The store will take the battery but if you can find the receipt or know the date you got it the store can look up the receipt so you can get your $12 back. But other than that you can return it to automotive when the autocare is open but they can not give you your money back for it without a receipt.