This is a genius idea, making it impossible to put batteries in the wrong way round!
Most battery compartments have a single contact on either side: one positive and one negative. For any device to work, you must insert the batteries in very specific directions.
Instead of one contact at either end, InstaLoad compartments have two contacts: a flat contact for the negative end of the battery and a recessed contact for the positive end. If the positive end of a battery is inserted against the contact, its narrower, protruding end only touches the positive contact. If the negative end is inserted, its flat end only touches the negative contact. It’s a remarkably simple design that forces us to ask why nobody has thought of it before.
via Microsoft’s InstaLoad Tech May Revolutionize Battery Use – Tested.














