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Thread: Battery Question

  1. #1
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    Default Battery Question

    I have a 1998 Pro Team 175 that i ordered with a 9.9 mercury.(all of my local lakes have a 10hp limit). I have always used the cranking battery for the motor and the deep cycle battery for the trolling motor. What i would like to do this year is replace both batteries with deep cycle batteries and wire them in series. This way, my trolling motor will have both batteries as a resource (allowing me to troll all day) and the 9.9 can use them as needed. Will this work or is my logic flawed here? Thanks for the advice.
    Mistertwister
    Here crappie, crappie, crappie, crappie......:D :D :D

  2. #2
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    Red face

    Well...you can certainly do what you want to do...just remember that the additional drain on the power sources may just leave you without enuff cranking amps to start your engine after a long day (or night) of fishing...especially if you're running a 12V light for night stalking...I know that from experience...after fishing all night, I wound up having to paddle my bass boat over 3 miles back to camp (against the wind)...won't ever have that kinda "brain fart" again...lol....

    Bushrod

  3. #3
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    Default

    Wiring batteries in series gives you 24V. You probably want to wire them in parallel, which still gives 12V, but almost double the capacity. With your 9.9, the starting load would be pretty small, and it would probably work out. The only downside is if your TM runs the batteries down, you may not be able to crank the outboard. But cranking a 9.9 by hand is too bad compared to the big gas-suckers.

  4. #4
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    Default

    Ok, let me get this straight. You want to use both batteries at the same time? If so, wire them pos to pos and neg to neg. The problem I see with this is,,, your locators will get interferance from one or both. Also you still may run the starting battery down till it won't start the motor. But with a 9.9 I'm sure the rope will start it. The charging system on a 9.9 will NOT recharge enough not to have to recharge after each use. Trolling motors that have speed numbers, as 1 thru 5, drain the batteries MUCH faster than those that have varaible speeds. Logic is fine and the deep cycle batt. will have enough cranking amps to start the 9.9. Use 1/0 battery cable to make the connections. Hope this helps and Good Luck fishin' <*)}}}><
    You'll see the difference,,,on the end of your line! PROUD MEMBER OF ​TEAM GEEZER

  5. #5
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    Default

    I've been doing it that way since 2000 when I bought my 25 Johnson and have yet, I take that back, one time ran the batteries down enough that the motor wouldn't start.
    Then I just drift fished for about 15 minutes and the batteries built back up enough to start the 25.
    Also, you can start that 9.9 with one hand all day long.
    Mike

  6. #6
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    Default My fault

    My fault catfan, i meant to say parallel. I have a 12 volt trolling motor.
    My outboard does have a rope, so running out of battery is not a problem. My main issue is trying to increase my capacity for trolling, without shoe-horning a second deep cycle battery in the compartment. Currently i have 1 each of deep cycle and cranking. I think by replacing both with identical deep cycle that i will get more use out of them. Now, the problem may be with the electronics. I have both a console and forward mounted sonars. Thanks for all of your alls input.
    Mistertwister
    Here crappie, crappie, crappie, crappie......:D :D :D

  7. #7
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    Default

    The reason for 2 different batteries is for the draw that the motors take. The battery for the big motor is built to have a rapid draw on the battery, while the Deep cycle battery is meant to be drawed down slowly. If you use a deep cycle trolling motor battery to start the main motor it will not last long. Minn Kota make's a battery that you can use for both the big motor and trolling motor though. You could get 2 of them and hook them parrellel.
    DO-GOODER EXTRADINAR :p

  8. #8
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    Default ok, i am getting some great suggestions.

    What about optima batteries. THese things are unbelievably expensive. But, they do have a blue top that is dual purpose. Cranking and trolling. Can anyone on here justify the cost of these babies?
    Mistertwister
    Here crappie, crappie, crappie, crappie......:D :D :D

  9. #9
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    Default

    Quote Originally Posted by Eager Beaver
    If you use a deep cycle trolling motor battery to start the main motor it will not last long.
    Cranking an outboard doesn't draw enough to really make a difference. Many people use deep cycles for cranking big outboards because running livewells and fishfinders etc. makes the use more of a deep-cycle load. You will do more damage deep cycling a cranking battery than cranking with a deep cycle. You do need to be aware of the CCA of the battery, because some outboards need high CCA to allow the computer to function properly while the battery is under cranking load.

  10. #10
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    Barnacle Bill is offline Super Mod and 2014 Crappie.com Man of the Year * Crappie.com Supporter
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    We have been running that setup for years on my buddies Tracker. 2 deep cycle batteries in parallel used for trolling and starting a 25hp Merc. No interference with the electronics and never had to hand start. They are big batteries (group 31 I believe). Its recommended, when doing that to use identical batteries and the same age.
    Fair Winds and Following Seas

    Bill H. PTC USN Ret
    Chesapeake, Va


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