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

  • Charger functions, Charger settings, Batteries, General, PRO25S, PRO25SE, PRO15S, CT5 POWERSPORT: Can you charge a lead acid battery with the Lithium mode?
    See answer

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

  • D250SE: How do I activate the Lithium setting?
    See answer

    The D250SE has a wiring harness with a black and a red wire, the black wire must be connected to battery positive (12V) to change the charging algorithm for Lithium (12V LiFePO₄) batteries.

  • D250SE: Can I use D250SE for lithium batteries?
    See answer

    Yes it works both with lead-acid and lithium (12V LiFePO₄) batteries.

  • Batteries: Can I charge Lithium batteries with a regular CTEK charger and vice versa?
    See answer

    No. Lithium batteries needs a different charge than lead/acid batteries. Due to severe risks if overcharging, we do not recommend using a CTEK charger that is developed for lead/acid batteries, for that purpose.
    Charging lead/acid batteries with a Lithium charger does not give the best result and cannot be recommended.

  • Charger functions, MXS 5.0 TEST&CHARGE: I have a CTEK charger. It used to work well, but now nothing happens when I press the mode button. I can't change between the "MC", "CAR” and "SNOWFLAKE” modes. What can I do?
    See answer

    If you can't change the charging mode by pressing the mode button regardless of which battery you are trying to charge, the charger is probably faulty. If you still have the warranty, I recommend you go to your dealer with the charger, the receipt and a completed warranty claim form.

  • CT5 TIME TO GO, CT5 TIME TO GO GULF EDITION: What is the difference between TIME TO GO and an MXS 5.0 charger?
    See answer

    TIME TO GO has a different display. Instead of the various charging steps, you see a display that counts down the time left until the battery can be used.

  • CT5 TIME TO GO, CT5 TIME TO GO GULF EDITION: I have a ride-on lawnmower. Can I use TIME TO GO to charge it?
    See answer

    Yes, you can, if you have a 12 V lead-acid battery. Note that TIME TO GO is optimized for batteries of 20 Ah upwards, so if your battery has a lower capacity than 20 Ah you should use a different charger, such as an MXS 3.8.

  • Marine, Charger functions, I1225: What is the difference between I1225 and XS25000?
    See answer

    I1225 is equipped with M10 ring terminals instead of clamps.

  • Charger functions, Batteries, PRO15S: Will my PRO15S charge lithium batteries?
    See answer

    Yes, it will charge all types of LFP / LiFePO4 Lithium Batteries when the Lithium programme is selected.

  • CTX BATTERY SENSE: How can I see more or less data in the graphs?
    See answer

    Double tap, scroll and/or pinch zoom in both graphs.