Seizaiken's mercury-free silver oxide batteries are manufactured in a high-tech clean room environment in a newly constructed factory. This facility was specifically designed for the manufacturing of ultra precision electronic devices and incorporates all new equipment. Within the clean room environment SII has eliminated contamination allowing us to ensure consistent quality. 

Seizaiken batteries are used in cameras, calculators, watches, toys, home health devices (glucose monitors, blood pressure cuffs and digital ear thermometers), computers, audio books, games, toys and more.