The SR621SW is a highly popular watch battery commonly used in a variety of wristwatches. It is a button cell battery with a diameter of 6.8mm and a thickness of 2.15mm. The battery chemistry is silver oxide, providing a reliable power source for timekeeping and other watch functions. It was first introduced by Seiko in Japan and has since been adopted by many watch manufacturers worldwide. The SR621SW offers a long shelf life, typically lasting up to five years. It has a voltage of 1.55V and a capacity of approximately 23mAh. The battery has a stable discharge curve, ensuring consistent performance throughout its life. It operates in a wide temperature range, from -10°C to +60°C, making it suitable for various environments. The SR621SW is mercury-free, adhering to environmental regulations. Its compact size and high energy density make it highly reliable and efficient. It features a pressure contact design for easy installation and replacement in watches. Due to its popularity, the SR621SW is readily available in many retail stores and online marketplaces.