tswoboda,
Thanks for posting that video. The Ice Hole power guy is very informative, I have watched many of his You Tube videos.
The first battery for my Marcum Shuttle only lasted one year but was replaced under warranty. The second battery for my shuttle crapped out over the summer. This was after 2 years of carefully following the storage guidelines from Marcum.
Now an running my Helix 7 on a 15A Amped Outdoors battery which runs about the same cost as sending the Marcum Shuttle in for new battery that may last 3 years. The Amped Outdoors battery will definitely last longer than that.
If you find a source for a LiFePO4 for the shuttle please post here.