Each Energizer Ultimate 2016 Battery holds power for up to 12 years in storage, so they're always ready when you need them. These batteries last up to 30% longer than the current Energizer Max range, delivering long-lasting, dependable performance in speciality devices like heart rate monitors, remotes, keyless entry systems and more. The secure, child-resistant packaging even has a handy size checker so you can make sure you have the right batteries for your device.