The Renata 371 SR920SW is a premium-quality silver oxide button cell battery designed for low-drain devices. With a nominal voltage of 1.55V and a capacity of 40mAh, it delivers consistent and long-lasting power, making it ideal for analog watches, calculators, and precision medical devices. Made in Switzerland, this original Renata battery offers high reliability, leak resistance, and extended shelf life, ensuring dependable performance in compact electronics.