Customer support


Welcome to CTEK and thank you for being a valued customer.

We are here to help and in this section you will find FAQs, troubleshooting, warranty information and video tutorials. If you can’t find what you are looking for, please contact us.

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Top 10 FAQ

  • CT5 START/STOP: Can I use the charger during the winter? It doesn't have a winter setting.
    See answer

    Yes, you can use the charger during the winter, as it has an inbuilt temperature sensor which regulates the output voltage depending on the ambient temperature.

  • PRO25S, PRO25SE, LITHIUM XS, PRO15S, PRO60, CT5 POWERSPORT: I have charged my lead acid battery with the lithium mode. Have I ruined the battery?
    See answer

    The battery will not be ruined but it will not be fully charged.

  • CT5 START/STOP: What do the three stages on the charger mean?
    See answer

    Check mode means that the charger is checking the battery’s state of health and preparing to charge. If the battery is in good condition, the Check stage doesn't take more than a few moments.
    The Charge mode LED shows while the charger is filling the battery, and Care shows when the battery is fully charged and the charger has automatically switched over to maintenance charging.

  • PRO25S, PRO25SE, LITHIUM XS, PRO15S, PRO60, CT5 POWERSPORT: Can I use lithium for lead acid and vice versa?
    See answer

    No - CTEK recommend the correct charge mode be used at all times.

  • CTX BATTERY SENSE: Can I place Battery Sense anywhere in the engine compartment?
    See answer

    You should place it so that it does not come into contact with moving, sharp, hot or otherwise unsuitable surfaces.

  • CTX BATTERY SENSE: How much battery power does it use?
    See answer

    It uses about 1 mA, equivalent to about 1 Ah per month. The normal rate of discharge from a battery is about 10 mA. If the vehicle is left unused for a long period we recommend that you charge the battery.

  • M25, MXS 7000, M100, M300, MXS 25EC, ZAFIR 100, M200, M15, MXS 7.0: is lit for 4 hours and then turns into error mode
    See answer

    If the battery voltage is not above 12,5V after 4h the charger will turn into error mode, because the voltage has not increased in the way it should have done.

    Explanation 1: The battery is too large in relation to the capacity of the charger.
    Test: Make sure that the battery/batteries size is not larger than the recommendations.
    Test: Try to restart the charger because the charger might need more time to charge the battery.

    Explanation 2: Larger loads are connected to the battery.
    Test: Disconnect the battery and try to charge it without the loads.
    Test: Try to restart the charger because the charger might need more time to charge the battery.

    Explanation 3: If the battery is warm and/or is boiling heavily during the charging, it is most likely due to a defective cell in the battery.
    Test: Change the battery.

  • XS 800: The charger does not switch from into maintenance charging
    See answer

    Explanation 1: Larger loads are connected to the battery at the same time.
    Test: Disconnect the loads from the battery and try to charge again.

    Explanation 2: Defective battery.
    Test: If possible, measure the voltage on the battery when the charging should be finished. If the voltage is under 7V the battery is most likely faulty.
    Test: Try the charger on another fresh battery.

  • MXT 4.0, M25, XS 0.8, M300, M200, M15: No LED’s are lit on the top row when the charger is connected to both the power outlet and the battery
    See answer

    The LED’s on the bottom row are lit and you can change charging mode. None of the LED’s in the top row, indicating charging status, are lit.

    Explanation: The battery voltage could be under 2+/-0.5V.
    Test: Test the charger on a fresh battery.

  • D250SE, D250SA: Do I need an external regulator for the solar panel?
    See answer