Need a Battery charger

I have an old craftsman I bought at a yard sale fo $20 with wheels. And I have a new expensive snap-on $300. The Craftsman is my Go to when I need to charge the Batteries in a Diesel with two batteries at once. I bought the snap-on because the craftsman broke a wheel . Now I just carry the craftsman. I'll sell you a real pretty snap-on if you want.