Trolling Battery???

[The_Red_Leaker]

I have a 34 lb. thrust Minn Kota electric that I use for trolling in the Red Leaker (14' aluminum). I have been using the Wal-mart deep cells and only been getting 3-4 hours at best before having to switch to the next battery. It is a pain and cumbersome to have to deal with two big batteries plus the fuel container for the 15 horse outboard that is used to get from place to place. Can anyone recommend a good battery that will last 8 or more hours to lighten the load in the Leaker?

Thanks,
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