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Interesting that so much focus was on the battery. I had the very same issue occur to my Lx-6s after using 6 or 7 days with the Marcum Lithium Ion Shuttle. The unit turns on, will work fine in simulation mode, but will often be frozen or become frozen when using it on the ice. It happened first when the shuttle was 87% charged, but also occurred several times when the shuttle was fully charged. Ducer clicks and on a couple of occasions the sonar worked for a very short time before the unit froze. I was guessing a bad ducer, but this is my second season with it. It hasn't been abused at all. In fact it really hasn't seen a full season. Replaced it with a Helix Ice unit, but this unit won't mount of the Marcum shuttle and chews through batteries.