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I don't know that the 406 ELT's are useless. Once they go off, they will start checking on you within minutes. Plus they can locate you to within a small area very quickly.
I'm still using the batteries from my first 406 elt. 2012, in my flashlight. These lithium batteries typically last 10+ years but I guess it's more about ongoing revenue for the elt manufacturers than airworthiness.
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