Get the most from your essential devices with the reliable, long-lasting power you’d expect from Energizer. Pack of four, stock up on CR2025 batteries for long-lasting, dependable performance in speciality devices like heart rate monitors, remotes, keyless entry systems, calculators and toys. This battery pack is also a great choice if you need a new car key battery. Each lithium battery holds power for up to 10 years while in storage and can withstand temperatures from -30º to 60ºC. They’re also responsibly designed with zero mercury and child-resistant safety packaging.