I'm new here,and new to ball machines. I always wanted one, but was never able to afford one. This past weekend, I actually found one at a yard sale and picked it up for $35 :shock: figuring that it was worth taking a chance on "as is". So far, I can't get it to charge, but figure that it may just be that the battery has died from sitting too long unused. I was wondering if anyone could tell me how to replace the battery (and where to find one at a decent price). Also looking for suggestions on how to clean it, or what else I might try if replacing the battery doesn't work. The machine itself is a Tennis Tutor, model #2 serial #2-11577. Copyright on the manual that came with it is 2000, so I assume the machine is about 10 years old. Any help will be greatly appreciated. Thanks guys!