Why do AED electrode pads expire?

AED electrode pads expire because the gel which helps conduct the electricity in the electrode pads can cause the metal electrode to break down. When this happens, the manufacturer cannot guarantee the AED will function properly. Most AED electrode pads have an 18 to 24 month expiration date, although some manufacturers offer electrode pads which will last 4-5 years. Once used, the electrode pads must be disposed of and cannot be reused.