Premium Power One Size 13 Hearing Aid Batteries - 120 Count (3 Packs of 40) - Long-Lasting Zinc-Air Batteries for Hearing Devices - Perfect for Travel, Daily Use & Emergency Backup

At power one, every battery is tested before it leaves the works - 100%. The comfort packaging then receives a quality seal, which safely seals and protects it. The rustproof batteries themselves have an outstanding service life, especially where high power demands are concerned. Behind all this is a special, patented technology that enhances the cell voltage.