Purchase includes 1 6-PACK of Power One P10 Batteries A long service life with a guaranteed high cell voltage thanks to a patented cathode technology makes frequent battery changing redundant and promises the best sound. Each individual cell is tested for its electrical and mechanical characteristics in accordance with its specifications. A highly developed film seal for every cell guarantees that the battery does not dry out or drain prematurely. The stainless steel housing provides high-level stability and safe protection against corrosion Featuring with its consumer-focused extra long tabs, Power One batteries are manufactured at the world's most up-to-date and biggest production site for hearing aid batteries in Ellwangen/Germany—well recognized for manufacturing quality and detailed precision. Subject to Germany's stringent safety guidelines and quality checks, every cell is tested for its electrical and mechanical characteristics in compliance with its specification.