The battery is the power source that enables a defibrillator to deliver a shock when someone has had a cardiac arrest. The most common fault with defibrillators is that the battery has died so you should ensure that your battery always has a decent amount of charge, and ensure you have a replacement on hand if needed. Some defibrillator batteries are rechargable, others are disposable, with a standby life of around 5 years on average.
*Please note there is currently an extended lead time on this product