The Defibtech Lithium Battery Pack is the non-rechargeable replacement lithium manganese dioxide battery made exclusively for your Defibtech Lifeline VIEW/ECG/PRO AED. This battery has a 4-year standby life (once installed in the AED) in rescue ready mode, with a full 4-year manufacturer's warranty. This battery features a capacity of up to 125 shocks, or 8 hours of continuous operation. This battery is for use with the Defibtech Lifeline VIEW/ECG/PRO AEDs.