Digital Hearing Aid Battery Tester – £4.95, free shipping is standard. A great little gadget to test if your hearing aid battery has any life left. Place the battery on the plate and a digital LCD readout tells you how much life the battery has left. Has a handy pull-out caddy to store spare batteries. Works with Rayovac, Duracell and other brands of hearing aid batteries. Please note – we only ship to UK postal addresses.