Mainly, I used the DLX models. That’s because those, I left batteries in them and they still work. Didn’t left them for months, I just placed them in like about two or three days ago I suppose. The regular ones, I did not put batteries in them yet because I hadn’t have a toy to test out batteries. The only thing I have to test batteries is my shake and go rescue squad Mater. Which I think it’s blah blah blah blah because I can only use three batteries at a time. Now, those blah blah blah, it doesn’t mean swearing. It means that very very very hard.