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.

  • D250S DUAL, SMARTPASS, D250SA, SMARTPASS 120: DC/DC - How do I connect?
    See answer
  • PRO25S, PRO25SE, LITHIUM XS, PRO15S, PRO60: I have charged my lead acid battery with lithium 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: Can I use lithium for lead acid and vice versa?
    See answer

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

  • 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.

  • General: What is ripple and how does it affect batteries?
    See answer

    Ripple is a measurement of the unevenness of the current and voltage supplied by the charger. High current ripple results in the heating up and drying out of a battery and in a shortened lifetime. High voltage ripple results in imprecise charging and can damage a vehicle‘s electronics. CTEK's chargers have a very 'pure' charge current and voltage, i.e. minimal ripple.

    See answer

    INDICATOR always flashes. It is to save battery power, as flashing draws less current tha a steady light.

  • MXS 25, PRO25S, PRO25SE, MXT 14, MXS 7000, PRO15S, M100, M300, MXS 25EC, M200, MXS 7.0: The charger has gone into maintenance mode but cannot see that the recond is completed?
    See answer

    The Recond program starts with the normal charging program but has a recondition phase inserted after the charging, automatically followed by the maintenance mode. The Recond light “R” on the upper row may be tricky to see, as it will be lit after the third charging lamp, and turns off after the recondition is done, (lasts 0,5h – 4h) and after that the 4th, green maintenance light will be lit.

    See answer

    When you add a sender for the first time:
    1. Is the Bluetooth on in the phone settings
    2. Are you close enough (10 meters)
    3. No thick walls between the phone and the Battery Sense?

    In case of repeated failure to add a sender:
    4. Is there more than one Battery Sense within 10 meters?

    When updating:
    1 – 3 as above.
    4.  Try to “pull-to-refresh” - what happens?

    To receive notifications:
    1. Are notifications turned on on the phone?
    2. Are notifications turned on on the app?
    3. Keep Bluetooth on.
    4. Do not close the app by sweeping it off the list of recently used apps.
    5. Open the app if you get the 7-day notification to reactivate background operation in case the app was shut down by the OS.
    6. Ensure you are near the Battery Sense (10 meters) now and then.