Nealrly finished that project and all you need is something to stop the 9 Volt battery rattling around? Well look no further. This is about as simple as it gets. Drill a 3mm mounting hole and fit an M3 screw and nut. Problem solved. The folded steel construction maintains a firm grip on the sides of the battery. Can be mounted on a flat surface or vertically.
9V metal battery retaining clip.