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The Philips HeartStart FR-2 Aviation Battery is made specifically for the Philips FR-2 AED and has a battery life of 5 years in the unit. Philips Healthcare warranties the battery for a full 4 years. This battery is TSO C-142 certified by the FAA.
Always make sure to keep a spare battery with your Philips HeartStart FR-2 in case it is possibly needed during a cardiac arrest emergency.