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  1. #1
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    Aug 2020
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    Post 3 Batteries in Cobra/Viper Coral?

    I'd like to hear from you if you've come up with a way to fit 3 batteries in a Cobra/Viper Coral. I want to install a 36 volt trolling motor.
    1998 Viper Coral 201
    1998 Mercury Promax 300
    Sportmaster lower-end

  2. Member
    Join Date
    Apr 2012
    Location
    Branson, MO
    Posts
    429
    #2
    My 2000 Viper Coral only had 2 batteries when I bought it, one battery shared by outboard motor and 24 volt trolling motor. I added a battery to isolate the trolling motor from the outboard motor. You probably want 4 batteries, 3 for TM and one for outboard. To do that, you would need to relocate a battery or oil tank to a storage locker. I have attached a photo of my Coral with 3 batteries.

    Battery Charger 006.JPG
    2000 Viper Coral 202
    2013 Pro XS 200

  3. Member
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    Aug 2020
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    California
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    #3
    Thanks for the post, and the pic! I assume those are two Group 24 batteries on the passenger side?
    1998 Viper Coral 201
    1998 Mercury Promax 300
    Sportmaster lower-end

  4. Member
    Join Date
    Apr 2012
    Location
    Branson, MO
    Posts
    429
    #4
    Quote Originally Posted by MrLeadfoot View Post
    Thanks for the post, and the pic! I assume those are two Group 24 batteries on the passenger side?
    Yes they are group 24 AGM batteries for my trolling motor. The battery on the starboard side is a group 27 because a group 31 was too long. This is an old photo. I have a new Northstar AGM, group 27 to provide starting power for my 2 stroke, ProXS 200 and accessories. PM me if you have questions.
    2000 Viper Coral 202
    2013 Pro XS 200

  5. Member
    Join Date
    Dec 2009
    Location
    Salt Lake City
    Posts
    408
    #5
    I moved the oil tank to the right side and put 2 27's in from the left side and a 24 perpendicular. After upgrading electronics I had to upgrade the main battery to a lithium. Crazy amount of power in the size of a 24. When the tm batteries go I'll upgrade to lithium as well. Not cheap but after having one for the main I appreciate the reliability.
    2000 Viper Coral 202/225 Pro Xs
    Ghost, HDS Lives, etc, etc.

  6. Irving-NorCal Irving-NorCal's Avatar
    Join Date
    Feb 2010
    Location
    Fairfield, Ca
    Posts
    104
    #6
    I have a 31 series battery behind the oil tank on the starboard side next to transom. I have two series 27 batteries on port side. I have a plastic board covering my pumps in bottom of boat that is secured with two screws. I used to carry a fourth battery there for black lights for night fishing. I didn't feel it was strong enough to hold that fourth battery all the time. If you replaced that plastic board with an aluminum piece that is re-enforced on the bottom it would work. I've considered doing that myself. I have a buddy that fabricates metal and he said no problem. Does your have the plastic board covering your pumps?
    Irving-NorCal
    2000 Cobra Viper 201 DC
    2024 Mercury 250L Pro XS SN# 3B431534
    Fury 3 Blade 24P

  7. Member
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    #7
    You have a Cobra, not a Coral. Corals have a 40 gallon gas tank in the back at the transom, so there is no way we can fit a 31 and two 27s, let alone a 4th battery. At best, we might be able to fit three 24s. Thanks for trying to help, though.
    1998 Viper Coral 201
    1998 Mercury Promax 300
    Sportmaster lower-end

  8. Member
    Join Date
    Nov 2013
    Location
    Texarkana, AR
    Posts
    1,308
    #8
    I have a 2000 coral that has 3 group 31 batteries in the back. The oil tank was moved to one of the storage compartments beside the livewell. The lines run through a hole in the compartment into the battery compartment. That all was done by the original owner. I'm the second owner. I cut and painted a board to fit across the bilge opening (secured with 4 screws) and one of the batteries sit on top of it and other 2 sit on each side.
    Joe

    2000 Viper Coral 202
    2001 Mercury 200 EFI

  9. Member
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    #9
    I thought about that, too, but I'm not willing to sacrifice a storage bin. I'm going to stick with a 24 volt system, for now, until Lithium batteries come way down.
    1998 Viper Coral 201
    1998 Mercury Promax 300
    Sportmaster lower-end