An efficient way to hold and use your “D” battery. The battery snaps into the flexible, plastic container so it does not roll around your desk top. Two small metal contacts can be expanded and used to attach either wires or alligator clips. No fuss, no mess, way better than a rubber band and two paperclips.
LL Demos & Labs: Adaptable Electron, Electrical Conductivity Tester, Wrapping Up Electromagnets