$49 - ACR AquaLink SARlink Battery - Save with user replaceable battery.
ACR ResQLink PLB 375 w/ expired battery questions: how to replace the battery myself, what does self-test really test, how long should it work if it self-tests OK, bring on Mt. Rainier
ACR Electronics ResQLink View PLB-425 Buoyant Personal Locator Beacon with Digital Display
ACR Battery Replacement Service for ResQLink Series PLBs (PLB-375)
Battery Replacement Service for ACR PLB-375
ACR ResQLink+ Personal Location Beacon (PLB) Basics - Alpine Science