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.

  • 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: 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.

  • 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.

  • D250SA, SMARTPASS 120: DC/DC - How do I connect?
    See answer
  • Charger functions, Batteries, PRO25S: Will my PRO25S charge AGM batteries?
    See answer

    Yes, it charges all lead-acid type batteries in normal mode.

  • CTX BATTERY SENSE: Why doesn’t the percentage show 100% when the voltage meter is higher than 12.8 V which is said to indicate a fully charged battery?
    See answer

    Measuring the voltage for estimating the charge status of a Lead Acid battery can only be done when the battery has been at rest for a certain period -sometimes more than 10 hours. This situation is likely to occur after charging the battery or after a ride with the car for instance. Battery Sence takes this into consderation when calculating the charge status.

  • SMARTPASS 120: Can the starter battery and the service battery be different types of battery?
    See answer

    Yes, (lead acid)

  • D250SA: Which fuse size shall I use for D250SA?
    See answer

    30 A