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There are regular speciality batteries, and then there are Energizer Speciality Batteries. So get the durable, reliable power that keeps going with this Energizer 357/303 Silver Oxide Button Cell Battery. It delivers long-lasting power to your button-battery-operated devices, from household electronics like keyless entry systems, to e-books, toys, calculators, and watches, to heart rate and glucose monitors. And these zero-mercury coin batteries can hold power for up to 5 years in storage. Choose Energizer Speciality Batteries for long-lasting power you can count on when you need it.