The VIKING™ CR2450 Lithium Battery is a high-quality power source designed specifically for use in VIKING auto darkening welding helmets, including models 3350, 3250D FGS, 2450, 2450D, and 1840 Series. With a robust capacity of 620 mAh, this lithium coin battery ensures a long usage life, making it an essential accessory for welders who rely on consistent performance. Manufactured in the United States, this battery is a reliable choice for those seeking dependable power solutions in their tools and safety equipment. Please note that certain models require two CR2450 batteries for optimal functionality.