Battery slots and springy thingies

I was replacing batteries in my remote, when this mind-numbing question arose:

Why does the springy end of the electric device always connect to the negative end of the battery?

Probably because the positive end usually has a bump, so the negative is easier to slide onto the spring. Though I believe I have seen some that were the other way around.

Most likely because it’s easier to tell which ways batteries go in that way. It takes too long to find the diagram on the remote of which way the batteries go, it’s simply easier to see a spring then a small diagram.

Also, Many springs wouldn’t actually connect with the positive end of the battery, the hole in the spring is so big that the positive end of the battery could fit in the spring without making contact.