Three triggers. First, on or before the printed expiration date, which is 2 years from date of manufacture. Order the replacement before the date arrives rather than after, so your program is never uncovered. Second, immediately after any deployment on a patient, because the pads are single-use and cannot be reinstalled. Third, whenever the package is damaged, opened, or shows signs of degradation, since Cardiac Science warns that damaged or expired pads may cause improper AED performance.
Practical program advice: set a calendar reminder 90 days before the printed date and record the pediatric expiration date in your maintenance log alongside the adult pad date and the battery date. The three cycles rarely align, which is how programs end up with an in-date AED and an expired pediatric set. Call Total AEDs at (855) 286-6384 to put adult pads, pediatric pads, and a G3 battery on a single replenishment order.