Philips HeartStart Home and OnSite AED Defibrillator Long Life Replacement Battery, a back-up power source for your Philips HeartStart FRx, OnSite or Home defibrillator A high-quality, disposable, lithium manganese dioxide battery with a five-year shelf life (four-year lifespan once installed) Make sure your Philips device is always ready by having a spare or replacement battery to hand What’s in the box: 1 Philips HeartStart Long Life LiMN02 Replacement Battery Please contact Philips directly with any questions regarding the performance or operation of your HeartStart products. Replacements are permitted for warranty purposes only