I used to believe that batteries in an appliance (like my old sony walkman) would 'spin' when the item was used.
I spent many hours quickly opening the battery compartment trying to see the batteries turning, but obviously didnt succeed!!
A childhood belief about physics

others believed things like this
- my nephew used to believe that when people died, they just needed new batteries.— p-daddy
- I used to believe that I could make a laser by putting more batteries in a flash light.— Tyler
- I used to think that putting batteries in your ears could electrocute your brain. Hahahaha.Anon
- I used to suck on the ends of batteries intent on gaining super electric powers. Anon
- I believed that if I swallowed my phlegm I would die. I spent hours spitting it out into the toilet.— chunky munky
- I used to believe that if a item wasn't "on sale" then you weren't aloud to buy it.— Meagan