This replacement standard Lifeline VIEW Defibtech battery (approx 4 years) is 12v and capable of performing 125 defibrillator shocks of 8 hours of continuous operation and works with the Lifeline View, ECG AND Pro models. The Lifeline Defibtech Battery is easy to install and comes with a separate lithium battery that is used to power the defibrillator’s self -test feature and it’s active status indicator.