Hi Gang
I have been using Spot on every flight (about 120 hours total) since
last May and have not had to replace the batteries yet. Today I found
that I had left the unit on for 2 days since my last flight. Since the
aircraft had been in its hanger Spot was unable to get a GPS fix and
had turned itself off from the 10 minute message mode that I use when
flying to the non message mode. The batteries are still OK. I
periodically check, as I did today after a flight, that my flight
messages are being saved and they were.
I think this speaks highly of Spot and earlier criticisms of its
lithium batteries I think are unjustified. Spot is a unique and useful
product for pilots and I won't fly without my Spot. My wife concurs
with me.
Dave