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I have an ACK-01 ELT installed in my 320, flying since 1994.  It has passed
every test that I have performed on it including pre-flight, post-flight and
shock activation (performed at annual inspection).  I have never had a false
alarm turn-on. The batteries that came with the ELT are Duracell MN1300D and
they last for 5 years under normal circumstances.

Bob Jude
N65BJ