The Sony 3Volt Lithium battery cr2032 is found in watches, computers, pedometers and more. Many different devices use this small but powerful workhorse. If your battery has died, replacing it is not a problem. Open the device and locate the battery. Some big box stores carry replacements, or find one online at places such as Amazon or Billy Bob's Batteries. The cost is small compared to replacing the entire device every time a battery dies.