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Help Battery Replacement

RZP455
RZP455
in Ford Focus Club

Featured Replies

  • Author

Ahh ok that makes sense the guy that had it before me put in additional mustang lights.  I wont be able to take out the battery for another week to recharge for 12 hours as you suggested but is it really a must ???

  • Quote


    You should always fully charge a new when you install it, as it's state of charge could be anything. When you reset the BMS it expects that it is starting with a new battery with a full charge.

    On modern cars with BMS the battery should be charged while it is still connected to the vehicle.

    The battery charger should be connected with the positive lead connected directly to the battery positive terminal. The charger negative lead should be connected to the main chassis earth point [NOT to the battery negative] This is so the BMS can detect the battery is being externally recharged and adjust the state of charge information that the system has.

    Chassis Earth.JPG

  • Quote
    • Thanks 1
    • Author

    Would this battery charger be OK ???

    IMG_20230209_225234.jpg

    IMG_20230212_214926.jpg

  • Quote
    • Like 1

    Yes that battery charger looks fine 👍

    remember connect the negative lead to the chassis earth point 😉

  • Quote
    • Thanks 1
    • Author

    Top man thanks so much, I will charge it for 12 hours while on the car like you suggested ???

  • Quote
    • Like 1

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