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  1. #11
    Click avatar for tech links/info K447's Avatar
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    Quote Originally Posted by beerdart View Post
    Your voltage needs to be checked with a good meter...
    It is impossible to have a 12v battery reading above 12.2v at rest.
    Actually, a fully charged and healthy lead-acid battery should read about 12.5-12.6 volts while resting, and a fully charged AGM battery is about 12.8 volts, rested.

    Fresh off the charger, a battery can read 13-ish volts for a while. Once the excess surface charge bleeds off, the battery becomes 'rested' after about 12 hours, and the terminal voltage more accurately reflects the state of charge.

    Open Circuit Voltage vs. State of Charge Comparison*

    % Charge__Flooded______ Gel__________ AGM
    100% ____12.60 or higher 12.85 or higher 12.80 or higher
    75% _____12.40 _______12.65 ________12.60
    50% _____12.20 _______12.35 ________12.30
    25% _____12.00 _______12.00 ________12.00
    0% ______11.80 _______11.80 ________11.80

    * The “true” O.C.V. of a battery can only be determined after the battery has been removed from the load (charge or discharge) for 24 hours.


  2. #12

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  3. #13
    Moderator beerdart's Avatar
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    Quote Originally Posted by K447 View Post
    Actually, a fully charged and healthy lead-acid battery should read about 12.5-12.6 volts while resting, and a fully charged AGM battery is about 12.8 volts, rested.

    Fresh off the charger, a battery can read 13-ish volts for a while. Once the excess surface charge bleeds off, the battery becomes 'rested' after about 12 hours, and the terminal voltage more accurately reflects the state of charge.

    Open Circuit Voltage vs. State of Charge Comparison*

    % Charge_Flooded______ Gel__________ AGM
    100 _____12.60 or higher 12.85 or higher 12.80 or higher
    75 ______12.40 _______12.65 ________12.60
    50 ______12.20 _______12.35 ________12.30
    25 ______12.00 _______12.00 ________12.00
    0 _______11.80 _______11.80 ________11.80

    * The “true” O.C.V. of a battery can only be determined after the battery has been removed from the load (charge or discharge) for 24 hours.

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