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Rodney Smith

Battery question for powering fish finder/electric start

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I am looking to shed some weight in my 16 ft Riverhawk Pro-Caster. The itself boat weighs  only 220 lbs. I now have about 150 lbs of batteries. I have two group 27 batteries that power my Minn Kota 80 lb Terrova. When I upgraded to a new Humminbird Helix 10 Mega SI , I added a group 24 (46 lbs) instead of the small tractor battery I had always used. I feel like the group 24 is too heavy and overkill just to run a fish finder and crank my 20 HP Tohatsu motor. From my reasearch, it appears that a battery like the one below (12 lbs) would work. Would it?


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I looked up the specs, your unit draws 1.2amps.  I plugged the following into the calculator above, 1.2 amps at 5 hour(fishing trip length), would require a 18ah battery to not drop below the 50% discharge level.  This is not taking into account cranking the engine, only running your fish finder.  

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