The new battery-less NightStar flashlight from Applied Innovative
Technologies uses rare earth magnets and a high-energy capacitor to power
its LED light source. When the torch is shaken, a neodymium charging
magnet rebounds inside a coil between two repulsion magnets and the
electrical energy generated is stored in a capacitor. It produces 20
minutes of light after being shaken for just 30s. The two zinc-plated
ceramic repulsion magnets are secured in place at either end of the
torch's polycarbonate housing using Araldite 2015 epoxy adhesive. This
epoxy was chosen following a number of trials and proved the only
adhesive suitable for the application. Indeed, in shear tests the
Araldite 2015 bonded ceramic magnets tore apart before the bonds broke.