The Philips Lithium Battery Pack is the replacement disposable lithium manganese dioxide battery for your Philips HeartStart FR3 AED. This battery pack has a shelf-life of 5 years from the date of manufacture so having an extra on hand is always a good idea. This Philips battery pack will last up to 3 years in your FR3 and it comes with a 3-year manufacturer's warranty. According to performance data from Philips, a new FR3 Battery Pack should provide up to 300 shocks or 12 hours of patient monitoring capability.