Get down to the cellular level: tiny CR2025/DL2025 button cells provide high energy for car keys, calculators, cameras and other electronic appliances. Rayovac has been manufacturing batteries in Wisconsin, USA since 1906 and the company has continued its innovation in battery cells for the civilian and military sectors ever since. Today, with over 600 employees worldwide, it produces more than 1 billion batteries per year as part of Spectrum Brands, from sites across America.