Energizer CR2025 Lithium Coin Batteries, Pack of 2. These batteries offer long-lasting, dependable performance in specialty devices like heart rate monitors, remotes, keyless entry systems, calculators, and toys. Each lithium battery holds power for up to 10 years in storage, ensuring they are always ready when needed. They perform reliably in extreme temperatures, withstanding -30º to 60º C, and are secured in child-resistant packaging for safety.