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  1. #1
    Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    Post "BATTERIES THAT MEET THE REQUIREMENTS"- Updated 09/26/22

    Ok guys:

    *** IMPORTANT NOTE: In a fishing application, DO NOT attempt to use the "minimum" specification as your cranking battery!!! You must add capacity for every electrical device in or attached to your boat!

    MANY thanks to CatFan for his HARD work compliling an updated list of Batteries with current batteries (including options for most any Mercury Outboard engine).

    975+ CCA (975 CCA or higher) is strongly recommended for 150 or Higher 4-Strokes.

    IMPORTANT UPDATE- 9/26/2022:

    Quote Originally Posted by SB 2022-19
    As of 9/26/2022, Mercury has issued Service Bulletin 2022-19 stating that the listed engines will be permitted to use a Lithium Iron Phosphate Battery that is designed for engine cranking, as long as it meets the listed specifications:

    -2.1L 75-115hp Fourstroke, ProXS and SeaPro Models
    -3.0L 150hp Fourstroke, ProXS and SeaPro
    -4.6L V8 and 3.4L V6 175-300hp Fourstroke, ProXS, SeaPro and Verado Models
    -2.6L L6 200-400 Pro and Verado Models
    -7.6L V12 500-600hp SeaPro and Verado Models.
    -NO other engines approved at this time.

    Minimum Specs Required:

    -Chemistry/Format: Lithium IRON Phosphate designed for MARINE CRANKING USE.
    -Minimum Cranking Amps: 800A for 8 second minimum @ 20 Degrees F
    -Peak Charge Acceptance: 165A at 20-130 degrees F for one minute
    -Max Charge Alternator Size: 150A at 20-130 degrees F
    -Max Charge Voltage/Alternator Output: 14.8V
    -Reserve Capacity (RC25 @ 80F): 135 Minutes
    -Ingress Protection (IP rating): IP67 or greater.

    Cautions that use at temperatures below 32F may require additional equipment such as a battery heater.

    Bulletin also lists a Relion Battery that has been evaluated and meets the above requirements: RB100-HP.

    https://relionbattery.com/products/lithium/rb100-hp




    See this link for:
    Almost anything you ever wanted to know about Batteries or Chargers

    __________________________________________________ ________________


    AGM BATTERIES: Suitable for ANY Alternator-Based Outboard Engine (DTS (All), Verado (All), Fourstroke (150+hp including the V6/V8 Fourstroke), Optimax (all) or (Alternator-Based 2-Stroke EFI engines ONLY)).
    Label Brand Part Number Retailer CCA MCA RC Weight Group Technology Manufacturer
    Vmax XCA31-1400 Various 1200 1400 205 78 31 AGM VMAX USA
    Odyssey 31M-PC2150 Various 1150 NR 205 77.8 31 AGM Enersys
    Northstar NSB-AGM-31M Various 1150 1370 220 75 31 AGM Enersys
    NLA-BPS Pro Series X-900 31 BPS/Cabela's 1150 1370 220 75 31 AGM Enersys
    Batteries Plus X2 Power SLI31AGMDPM Batteries Plus 1150 1370 220 75 31 AGM Enersys
    __________________________________________________ ________________________________
    "Budget" Traditional Wet-Cell (COMMERCIAL) Batteries (Suitable for Optimax (all), 2-Stroke EFI (all), 4-Strokes below 150hp):

    Although we strongly recommend batteries from the choices ABOVE this chart, these batteries provide an option for those who might be on a tight budget, and are relatively easy to find. These batteries CAN be used with Stator-type Charging Systems.

    Label Brand Part Number Retailer CCA MCA RC Weight Group Technology Manufacturer
    Interstate 31-XHD Interstate Dealers 1000 1250 195 61.4 31 Conventional Flooded Clarios(Formerly Johnson Controls)
    Interstate 31-MHD Interstate Dealers 950 1190 195 59.9 31 Conventional Flooded Clarios(Formerly Johnson Controls)
    Duralast 31-950 Autozone 950 1185 195 59.91 31 Conventional Flooded Clarios(Formerly Johnson Controls)
    Carquest 31S30 Car Quest/Advance Auto 950 1185 175 NR 31 Conventional Flooded Clarios(Formerly Johnson Controls)
    Deka 1131MF Various 950 1170 175 56.5 31 Conventional Flooded East Penn
    Exide XHP-31D Various 950 1100 190 NR 31 Conventional Flooded Exide
    NAPA* BAT 7236* NAPA* 950* 1170 175 56.5 31 Conventional Flooded East Penn
    Super Start 31-5T O'Reilly Auto Parts 950 1170 175 56.5 31 Conventional Flooded East Penn

    * Due to the sheer number of NAPA batteries with similar specs, only one is listed. Verify terminal configuration and CCA rating of your chosen model exceeds the requirements for your setup.
    __________________________________________________ _______________________

    "Other" Batteries: (Sometimes used as trolling, house, or small-engine Cranking Batteries)
    (These batteries are not suitable choices for 150+hp engines in a fishing application)


    Label Brand Part Number Retailer CCA MCA RC Weight Group Technology Manufacturer
    Exide 31XHE Various 935 1050 180 NR 31 Conventional Flooded Exide
    Northstar NSB-AGM-27M Various 930 1080 195 68 27 AGM Enersys
    BPS Pro Series X-900 27 BPS/Cabela's 930 1080 195 NR 27 AGM Enersys
    Batteries Plus X2 Power SLI27AGMDPM Batteries Plus 930 1080 195 68 27 AGM Enersys
    Exide HP-31D Various 925 1050 180 NR 31 Conventional Flooded Exide
    Exide XRF-31D Various 925 1110 200 NR 31 AGM Exide
    Exide XRF-31E Various 925 1110 200 NR 31 AGM Exide
    Exide Megacycle XMC-31 Various 925 1110 200 71 31 AGM Exide
    Interstate 31M-AGM Interstate Dealers 925 1190 200 69 31 AGM
    Optima Blue Top D31M Various 900 NR 155 59.8 31 AGM Clarios(Formerly Johnson Controls)
    Northstar NSB-AGM24M Various 840 1010 160 58 24 AGM Enersys
    BPS Pro Series X-900 24 BPS/Cabela's 840 1010 160 58 24 AGM Enersys
    Batteries Plus X2 Power SLI24AGMDPM Batteries Plus 840 1010 160 58 24 AGM Enersys
    Duracell 31DTMAGM Sam's Club 800 1000 200 67.5 31 AGM East Penn
    Deka Intimidator 8A31DTM Various 800 1000 200 67.5 31 AGM East Penn
    Power-Tec 8A31DTM Defender Marine 800 1000 200 67.5 31 AGM East Penn
    Remy Battery 8A31DTM Various 800 1000 200 67.5 31 AGM East Penn
    Optima Blue Top D27M Various 800 NR 140 53.8 27 AGM Clarios(Formerly Johnson Controls)
    West Marine WM8A31DTM West Marine 800 1000 200 67.5 31 AGM East Penn


    IMPORTANT NOTE
    :

    STRONGLY RECOMMEND the installation of a CLAMP-STYLE battery terminal on most of these batteries. This gives you a THREADED connection, that is CLAMPED to the largest/strongest connection point the battery has to offer (and often prevents MANY problems that can creep up down the road).

    Example:



    Make ALL connections to the terminal as described below:

    Battery terminal connections should be installed ENGINE CABLE FIRST, remaining lugs "Largest to Smallest", and finish off the connection with a Stainless Locknut (do NOT use wing-nuts).


    BEFORE INSTALLING A NYLOCK NUT ON A BATTERY TERMINAL
    :
    IT SHOULD BE PRE-THREADED ONTO A SUITABLE BOLT FULLY, AND REMOVED FROM THE BOLT (to ensure nylock is pre-threaded, and no abnormalities exist in the nut).

    Failure to follow this step MAY result in damage to the threaded terminals inside the battery
    (and subsequent intermittent or total failure of the battery to charge or perform properly).

    Updated July 7, 2020 with Additional Battery Info.

    MANY thanks to CatFan for his HARD WORK compliling these battery lists with updated/current information!
    Attached Images Attached Images
    Last edited by EuropeanAM; Yesterday at 10:54 AM. Reason: Updated Battery Lists (Compliments of CatFan)


    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
    Still consider myself a "Marine Apprentice" after 46 years (learn something new every day).
    Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor

  2. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    #2
    THREAD UPDATED 4/23/2021.

    Approximately 30 pages of outdated posts and information have been removed, essentially posts from 6/2008 - 6/2018. This was simply in an effort to reduce the amount of reading to what might actually be available for consumers "today".

    All current-model and current-list material has been retained.
    Last edited by EuropeanAM; 04-23-2021 at 05:56 PM.


    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
    Still consider myself a "Marine Apprentice" after 46 years (learn something new every day).
    Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor

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    #3
    I get what you are saying but...…………….Don has stated ONE start battery numerous times, which leads one to believe that he was given this information during TECHNICAL TRAINING with MERCURY. I doubt that Don would just make up the ONE start battery fact, if it was not true.



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    #4
    Just spoke with Mercury and they dont have an issue with 12 volt parallel. There is really nothing different just more storage. But be sure to keep them charged in full before every outing otherwise you can tax your alternator and charging system. As long as you are fully charged both batteries before each use, you should be fine. But please call to confirm, call Mercury. They are ready and willing to answer this question. It would be good to see if you got the same answer as i did.

    Tom

  5. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    #5
    [QUOTE=Ed R]I have yet to find in writing from/by Mercury, that Mercury specifically does not recommend using two (2) batteries in parallel. All I can find is... "Do not use deep cycle batteries." "Engines must use a marine starting battery with 1000MCA, 800 CCA or 180Ah."


    Quote Originally Posted by tomloans View Post
    Just spoke with Mercury and they dont have an issue with 12 volt parallel. There is really nothing different just more storage. But be sure to keep them charged in full before every outing otherwise you can tax your alternator and charging system. As long as you are fully charged both batteries before each use, you should be fine. But please call to confirm, call Mercury. They are ready and willing to answer this question. It would be good to see if you got the same answer as i did.

    Tom
    Tom & Ed:

    This subject has been brought up and beat to death over and over. Here's the "skinny" on the situation:

    1. Alternator. It was designed to Maintain the Fully-Charged state of ONE Properly Rated, Fully Charged Battery. Not two, three, four, or six.

    2. Parallel banks: Theoretically, a Parallel bank can produce a SUBSTANTIALLY higher capacity than a single battery. HOWEVER- this assumes that the health and charge of BOTH batteries remains "identical". If one battery becomes even slightly less healthy, it begins to sap the "good" battery and also overloads the charging system.

    Mercury offers Battery Isolator Kits that "permit" the use of multiple batteries. That is intended to be accomplished by isolating the second battery with an isolator.

    The answer you get when you post questions to Mercury will depend on who you speak with. I can assure you that the answer coming from Mercury's University division isn't recommending running multiple-parallel batteries.

    And I'll go so far as to say that Product Integration and Engineering would probably give an answer very similar to this one.

    Let's move along....


    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
    Still consider myself a "Marine Apprentice" after 46 years (learn something new every day).
    Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor

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    #6
    Excellent reply. Thanks and very good to know!

  7. Member 76Champ's Avatar
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    #7
    can you post links to Mercury recommendations or best practice data, or is this all verbal in class/training?
    -Justin
    2006 Stratos 294 - 200 Merc Optimax

  8. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    #8
    Post #1 contains the recommendations (it has been updated with some new batteries/info since original publish date, of course).

    Much of the information can be gleaned from a combination of Service Manuals, Owner's Manuals, and Technician Training notes (that last one isn't something everyone will have, of course).


    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
    Still consider myself a "Marine Apprentice" after 46 years (learn something new every day).
    Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor

  9. Member 76Champ's Avatar
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    #9
    Thanks Don. I've seen more and more pros with dual cranking batteries in parallel in their "walkthroughs." Are they running isolator kits then, or just ignoring the recommendation due to the limited time they run their boats and aren't concerned with alternator workload they are putting on their boats (or any other reason Mercury has, just using ur post above as example).
    -Justin
    2006 Stratos 294 - 200 Merc Optimax

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    #10
    Quote Originally Posted by EuropeanAM View Post
    Post #1 contains the recommendations (it has been updated with some new batteries/info since original publish date, of course).

    Much of the information can be gleaned from a combination of Service Manuals, Owner's Manuals, and Technician Training notes (that last one isn't something everyone will have, of course).
    Just to play devil's advocate Don ( because I find this topic interesting ), if you have two healthy batteries in parallel, there should be no issue at all provided both batteries are healthy and charged. At the same time, if one battery were in bad shape or shorted for any reason, your mercury monitor would quickly let you know. Why would this be an issue? it would be no different that a bad cell in my one battery, the same thing would happen.

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    #11
    Mermonitor can NOT tell if there is an issue with ONE of two start batterires connected in parallel.



  12. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    #12
    Quote Originally Posted by tomloans View Post
    Just to play devil's advocate Don ( because I find this topic interesting ), if you have two healthy batteries in parallel, there should be no issue at all provided both batteries are healthy and charged. At the same time, if one battery were in bad shape or shorted for any reason, your mercury monitor would quickly let you know. Why would this be an issue? it would be no different that a bad cell in my one battery, the same thing would happen.
    As Savage stated. your MercMonitor is NOT capable of telling you that you have a bad battery. It is ONLY capable of reporting the LESSER of MPR Voltage or PCM Wake Power Voltage, AND Engine Faults.

    And one bad battery in a "parallel bank" doesn't act just like a single battery. It depletes the GOOD battery, and overloads the charging system with a much higher demand cycle than normal.

    No need to continue beating the topic to death- the recommendation stands. We understand that you'll run what you want.


    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
    Still consider myself a "Marine Apprentice" after 46 years (learn something new every day).
    Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor

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    #13
    Hey no issues at all. Just thinking outloud. Thanks for your help and this great website. It has saved my bacon many times! Funny thing is that I came across this website so many times in the past but never dug in before I bought the merc and Champion combo last year and someone recommended this site. Great resource for sure. Thank you both.

    Tom

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    #14
    Don,

    I got caught out on Lake Erie yesterday and noticed my engine was having trouble starting. Merc Smart Craft showed 14.1 while running but when I started you seen it drop down to 11.6. I then ran back near ramp and fished out day.

    Battery that is installed is Deka Marine Master 24M7 unfortunately I have no room to upgrade in my Crestliner PT20 with 3 trolling motor 27's, 1 Power Pole, Charger there is not any more room for a larger cranking battery.

    I just installed Lowrance 3D, Hydrowave plus have two HDS Carbon 9's and one power pole with airrator running all day I can see where I am having some issues.

    The Deka Marine Master is just 13 months old.

    So what options do I have with a 24 size battery? Does a 34M offer me anymore capacity?

    I been looking at Cabelas x-900 or Battery Plus X2? Any other option?
    2019 Crestliner PT 20 - Mercury 200 Pro XS 4s - Columbus, OH




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    #15
    Do you charge it every time before you go out? Also that is one of the largest capacity batteries out there. Could it be that it was a lemon and the next one will do better. It shouldn't drop down to 11.6 unless you have a number of heavy electronics running at once like your tilt, power pole, etc.. My alarm will go off if I run my trim and tilt and hydraulic jack at the same time for more than 5 seconds during idle speed. I think you have a bad battery.

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    #16
    Yes I do charge every time I was on the water.

    When I got home yesterday I pulled it out of boat, I haven't charged it yet and it measured 12.7v but when engine started yesterday it was dropping to 11.6.

    I will give me dealer a call today as well.
    2019 Crestliner PT 20 - Mercury 200 Pro XS 4s - Columbus, OH




  17. Electrical/Wiring/Trolling Motors Moderator CatFan's Avatar
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    #17
    Quote Originally Posted by gordonsweb View Post
    Yes I do charge every time I was on the water.

    When I got home yesterday I pulled it out of boat, I haven't charged it yet and it measured 12.7v but when engine started yesterday it was dropping to 11.6.

    I will give me dealer a call today as well.
    You mean the voltage is dropping while cranking or when the engine is running?

    You should always charge the battery as soon as possible after fishing. Even a one day delay is very hard on a battery.
    If you have integrity, nothing else matters. If you don't have integrity,
    nothing else matters.​

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    #18
    The voltage should suffer when starting the motor. that is a huge load on the battery. Not sure to what extent but I am wondering if you have a different problem than the battery.

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    #19
    Voltage drop when cranking. Showing 14.1 when running. Batteries are charged the day it comes off the water.
    2019 Crestliner PT 20 - Mercury 200 Pro XS 4s - Columbus, OH




  20. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    #20
    11.6 while starter is cranking isn't really bad- that's a heavy load.

    Make sure your connections are solid- if possible use CLAMP on terminals, then use the stud on that terminal to connect cable lugs.

    ENGINE CABLE FIRST, remaining ones Largest to Smallest, and finish off with a Stainless Nylock (pre-thread on a bolt FIRST).


    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
    Still consider myself a "Marine Apprentice" after 46 years (learn something new every day).
    Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor

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