The HeartSine Adult Pad/Pak only has to be changed once every 4-years (if not used). This eliminates the usual 2-year change of pads on other units and so is less costly and easier to maintain than other AEDs. They are easy to replace: simply pinch the sides of the old pads cartridge to remove and slide the new ones in. It sometimes helps if you place the AED face up on a flat surface and, with the old pads out, slide the new ones in.
[We suggest after you put in the new pads, that you open up the old ones and show everyone who might use them what they look like. Then cut off the pads and dispose in garbage. Take the battery part to Home Depot or another recycle station.]
Note: Core tracks the expiration date of these pads and batteries and will let you know when they are about to expire. This is a free service.