Panasonic METAL AA batteries were developed for the value minded consumer and are a great option for low drain devices. These Super Heavy Duty Power batteries feature Carbon Zinc chemistry which is ideal for use in wall and desk clocks, remote controls, and other low drain devices. These batteries are also Mercury Free. Super Heavy Duty Power battery cells are engineered by Panasonic, a trusted industry leader in battery technology since 1931. All of our batteries are manufactured in Panasonic factories worldwide. Super Heavy Duty Power batteries deliver exceptional value for low drain devices.