#PSA : if you use a personal locator beacon ( #PLB ) and wish NOT to spend a small fortune on a replacement battery every five years, here is a source of quality replacement batteries: https://beaconbatteryreplacement.com/ beaconbatteryreplacement.com/

followup:

All it took is two screws to open the #plb and take out a shrink wrapped 3-cell battery. It is composed of three CR123 Lithium Manganese Dioxide non-rechargeable cells wired in series. Popped in the new battery and good for another 5 years!!