The Renata 379 SR521SW is a premium silver oxide button cell battery, designed to deliver reliable and consistent power for low-drain devices. With a nominal voltage of 1.55V and a capacity of 16mAh, this compact battery is ideal for analog watches, small medical devices, and precision instruments. Made in Switzerland, the Renata 379 is known for its leak-proof construction, excellent shelf life, and dependable performance in delicate electronics.