My point was that the batteries don't have to last forever. If the location is determined, SAR will likely to to the location even if the device stops transmitting.
If the PLB has no GPS, or the GPS couldn't get a fix, then the accuracy of SARSAT is perhaps .5 to 1 miles.
The problem here probably isn't "can the batteries last long enough" but "can the survivors last long enough".
Even if they had activated a PLB on the first day a rescue might not have happened then. If the SAR team leader gets a notice at 1pm with bad weather moving in at 3pm or 4pm, the rescue might be put off until the next day rather than put SAR personnel on the mountain in bad weather as it is getting dark...
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