This replacement non-rechargeable battery pack is compatible with the Defibtech Lifeline View, ECG and Pro defibrillators. Upon installation and when the device is in standby mode, the battery pack can provide power for up to 4 years. The battery pack has the capacity to deliver up to 125 shocks or 8 hours of continuous operation if needed for lifesaving treatment. The battery is easy to install and the defibrillator provides visual and audible low battery indicators when to ensure your defibrillator is always rescue ready.