This battery fits two of Philips defibrillators, Heartstart HS1 and Heartstart FRx. The battery is marked with an “install before” date, meaning the last date to install it in your defibrillator. After installation, the battery will work for four years. Thereafter it needs to be replaced every four years for the defibrillator to work. When using the defibrillator, the battery has enough power for 4 hours or 200 electric shocks.
When it is time to change the battery, the defibrillator will begin to beep. At that point, there is enough capacity left for 11 electric shocks.