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: Is the START/STOP a simpler charger than the MXS 5.0? It has only three lights while the MXS 5.0 has eight.
    See answer

    No. On the MXS 5.0 a light shows for every step, and the voltage and power curve is shown above and below the lights. On the START/STOP we've chosen to reduce the number of lights and instead just show which phase the charger is currently in – Check, Charge or Care. START/STOP has no programme selection. Instead, when it is in contact with a battery it starts as soon as it's plugged into a wall socket.

  • 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.

  • 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.

  • D250SA, SMARTPASS 120: DC/DC - How do I connect?
    See answer
  • 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.

  • 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.

  • PRO60: Is it a jumpstarter?
    See answer


  • PRO60: How does the “fanless”- thing work?
    See answer

    Convection through the central chimney of the PRO60

  • MXT 4.0: The error LED is lit
    See answer

    Explanation 1: Reverse polarity.
    Test: Make sure that the + cable/clamp is connected to the + terminal and the – cable/clamp is connected to the – terminal.

    Explanation 2: The clamps are short circuited.

    Explanation 3: Loads are connected to the battery which requires more power than the charger can provide.
    Test: Turn off or disconnect the loads when charging.

  • MXS 3.6, M45, MXS 3600: No LED is lit when the charger is connected only to the battery
    See answer

    Explanation: The charger requires voltage from the battery for the Standby LED to be lit.
    Test: Connect the charger to a fresh battery.