Rayovac provides you with a full lineup of speciality batteries to meet all of your needs. The Rayovac 303/357 is commonly used in watches, calculators, remote controls, medical devices and much more. You can count on this battery because of its reliable and long-lasting power. Rayovac batteries are known for their high performance and continuous energy, giving your applications longer periods of runtime. They last just as long as the other top brands and are an affordable power source that you can rely on.