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And if ya day pack was away from you when you stepped in the hole and broke ya leg, you might still be there unless you could crawl back to your bag.

If you get the proper authorised person to change the battery, you should get another 7 years of battery life out of it ( unless you have the very old 5 year battery life one).

Yeah I would recommend the PLB as well. 406MHz is good and they also have a 102ishMHz for narrowing down the search area even more.
Good to have a system where the battery is solely used for...