There are also seals to consider when opening up a PLB to change the batteries. At least for me, I want to know that the unit is sealed correctly, can be submerged and still functions 100% with the fresh batteries.

That said, the only time the battery will be used is when I consider my life to be on the line and at that point, the ResQLink is mission complete. ACR might want it for their "Wall of Fame" but I'll put it on mine and buy a new unit.