Emergency Position Indicating Radio Beacons (EPIRBs) and Personal Locator Beacons (PLBs) are equipped with long lasting lithium batteries. These batteries must be replaced by the expiration date marked on the unit or after being activated. We are an authorized service station for ACR, McMurdo and Kannad products, and can replace your EPIRB or PLB batteries quickly and with precision to get you safely back out there doing the activities you enjoy most!