Duracell 9V battery

Rectangular 9V battery as I remember as a kid powering my new fangled transistor radio to listen to Radio Luxemburg, from the UK. Why? I was 12, don't judge me. I doubt many people have a transistor radio now, but they also power Voltmeters, Tuning Meters, and remote controls for toys. We have sold over 1,600 of them, so they are still very popular.