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Lots of snow Porsche away
Join Date: May 2011
Location: Calgary Alberta
Posts: 11,839
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ELT's CVRs and FDRs all use hard lifed batteries. The units, under the FAA, are performance checked and recertified every 24 months, the batteries are replaced on the OEM's published schedule, usually 5 years.
Very unusual to have one fail before life, I have never seen it. Like most things in aviation, if they say it will signal for 30 days, it has probably been established that it will signal for 60 days minimum, and then derated for safety.
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76 911S
86 GMC K1500
78 XS750 cafe racer to be
79 XS750 because one is just not enough
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