I would go with 2 batteries myself, 2 grp 24's from WM, one being a deep cycle for the FF and other accessories. I tried a U-1 to power my HDS 8 &7 with SS, and a 2d HB 788 ci HD, lasted 6 hrs and all 3 shut down w/in 30 seconds of each other. People say the HDS units don't pull much but my U-1 was and is in good shape. I put a grp 24 in its place and it's only down 20% after 6 hrs of fishing with all 3 FF going.
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