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  1. 04-02-2018, 03:55 PM #1
    deadwood
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    Mercury 50 HP 4 Stroke Charging System and AGM Cranking Batteries

    SN 1C311111
    I need to replace my cranking battery for my 50 HP Mercury 4 stroke. I would like to go with an AGM battery. Is the charging system for my motor compatible with AGM batteries? Thanks
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  2. EuropeanAM
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    Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    #2 04-03-2018, 02:21 PM
    The Stator-type system used on your engine is not designed for use with AGM, Maintenance Free or Deep-Cycle Batteries.

    Choose a well-rated WET cell battery.


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    Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
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  3. deadwood
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    #3 04-03-2018, 11:05 PM
    Thanks. I’m glad I asked, as I had just about decided to try a AGM.
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  4. Weez556
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    #4 04-08-2018, 09:48 AM
    This is getting tuff I have a 2013 60HP Mercury 4 stroke and need to replace my cranking battery. Was looking at a Walmart Ever Start. But the new one's are Maintenance Free. They have them in local store but not showing online. EverStart 24-XMS 1000 MCA $75.
    So I know no AGM and no Deep Cycle and now no Maintenance Free.
    Guess I need to keep looking.

    Ser# 1C193731
    Last edited by Weez556; 04-08-2018 at 03:22 PM. Reason: Ser #
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  5. 5keepers2
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    #5 04-08-2018, 02:12 PM
    My old 1993 XR6 150 HP said no AGM batteries, I ran deep cycle/cranking battery on it for
    25 years and as far as I know it is still going.
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