Customer support

FAQ

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. For fastest response please write to us in English.

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Top 10 FAQ

  • CTX BATTERY SENSE: Battery Sense Software update
    See answer

    12th July Issues have been reported with the latest update on our Battery sense app – our developers are currently working hard to rectify the issue. In the mean time we have taken the decision to roll back to the previous version of the app, We have been assured this will happen over the next few days - iOS first then Android to follow.

  • Charger settings: AGM / * Snowflake
    See answer

    Because the AGM battery has a low internal resistance it can accept a higher charge voltage, in this mode the Bulk charge rate is 14.7v which is the optimum chare rate for the AGM type battery. In cold weather the internal battery chemistry slows considerably, this leads to the battery being reluctant to accept charge at a normal rate. By raising the charge rate to 14.7 (15v on the Polar) the battery accepts charge more readily

  • Batteries: CA/CA
    See answer

    Calcium Calcium batteries are a flooded low maintenance or maintenance free battery usually VRLA type . During construction some of the Antimony used in the construction is replaced by Calcium (2% approx). The benefits are a more robust grid, low water loss and longer shelf life.

  • Charger settings: RECOND
    See answer

    A mode that is used for reviving deeply discharged batteries, breaking down sulphation and reversing acid stratification. It requires a manual selection from the user and will add an extra step to the charge cycle, It uses a voltage of 15.8v to deliberately gas the battery in a controlled way in order to re-mix the acid to get an optimized acid balance (acid weight). This mode is also recommended for Ca/Ca batteries which require the higher voltage when charging.

  • Batteries: Can I charge without removing the battery from the vehicle, or opening the caps?
    See answer

    There is no reason to disconnect or remove the battery from the vehicle, or open the battery caps, while charging. CTEK chargers are spark proof and reverse polarity protected and electronic safe.

  • Installation: CTEK manual says: ”Connect the black clamp to the vehicle chassis remote from the fuel pipe and the battery" . In the picture beside is shown, that the black clamp is connected to the battery's negative pole. What is right?
    See answer

    The text describes how to connect to a battery in a vehicle. The picture shows how to connect to a battery not connected to a vehicle.
    The charger should be connected according to the vehicle user manual.

  • D250SE, D250SA: Do I need to use solar?
    See answer

    No

  • MXS 25, MXT 4.0, MXS 3.6, M25, PRO25S, PRO25SE, MXS 5.0 CHECK, M45, MXT 14, MXS 7000, PRO15S, MXS 5.0 POLAR, MXS 10EC, MXS 10, M100, MXS 3600, M300, MXS 25EC, MXS 5.0 TEST&CHARGE, M200, M15, MXS 7.0: No LED is lit when the charger is connected only to the power outlet
    See answer

    Explanation: One of the LED’s at the lower row should light up when the charger is connected to the power outlet.
    Test: Make sure that there is power from the power outlet.

  • D250SA: How do I activate the AGM setting?
    See answer

    The D250SA has a wiring harness with a black and a red wire, the black wire must be earthed / grounded to change the charging voltage for AGM.

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

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

  • General: A CTEK charger is so small. How can it charge so quickly and efficiently, when compared with ordinary chargers?

    CTEK's chargers use the same type of technology that computers use to reduce dimensions, to increase power and to charge using a well controlled and 'pure' current. Also, think how big mobile telephones were 15 years ago and how small they are today, and can even so do so much more.

  • Charger functions: Absorption

    The control of gassing within the battery is very important when charging. At the end of the Bulk stage the battery is beginning to gas freely, if we were to continue with constant current and voltage the battery would gas excessively. In Absorption the voltage is now constant and the current is reduced to take the battery from 80% to 100% with minimal gassing, the CTEK charger is constantly responding to the amount of current the battery is taking and reducing accordingly.

  • Batteries: AGM

    AGM stands for Absorbed Glass Mat and differs from a standard Flooded battery in that the electrolite is held on a glass mat and pressed against the active plate area, instead of being allowed to flood around the plates. This type of battery has a low internal resistance and can accept charge very quickly making it ideal for the modern start stop systems. If the battery casing should become damaged the electrolite will not leak out.

  • Charger settings: AGM / * Snowflake

    Because the AGM battery has a low internal resistance it can accept a higher charge voltage, in this mode the Bulk charge rate is 14.7v which is the optimum chare rate for the AGM type battery. In cold weather the internal battery chemistry slows considerably, this leads to the battery being reluctant to accept charge at a normal rate. By raising the charge rate to 14.7 (15v on the Polar) the battery accepts charge more readily

  • Marine: Are the primary and secondary sides galvanically separated in your chargers?

    Yes, all CTEK chargers are galvanically separated.

  • Charger functions: Are there CTEK chargers for other battery types?

    CTEK also produces the CTEK LITHIUM XS charger, which has an ideal charging programme for 4x LiFePO4 (lithium iron phosphate) with a nominal 12V terminal voltage.
    The CTEK LITHIUM XS can also communicate with the battery's built-in electronics if the electronics have shut down the battery to protect it against deep discharging.

  • CTX BATTERY SENSE: Battery Sense Software update

    12th July Issues have been reported with the latest update on our Battery sense app – our developers are currently working hard to rectify the issue. In the mean time we have taken the decision to roll back to the previous version of the app, We have been assured this will happen over the next few days - iOS first then Android to follow.

  • Charger settings: BOOST

    This mode is used on the much larger professional units and is designed to eliminate acid stratification on larger batteries or battery banks. The voltage is increased anything up to 15.8V in 12V mode or 31.6V in 24V mode, and a timer is user selectable between 8 hrs and 24hrs.

  • Charger functions: Bulk

    A stage of intelligent charging where the battery is taken to approx 80% of full charge. This is achieved with constant current and a rising voltage. The cut off voltage can vary dependant on the type of battery being charged e.g. Flooded battery has a bulk charge voltage of 14.4v whereas the AGM has a cut off voltage of 14.7v. Note possible temperature compensation that makes the voltage vary depending on ambient temperature.

  • Batteries: CA/CA

    Calcium Calcium batteries are a flooded low maintenance or maintenance free battery usually VRLA type . During construction some of the Antimony used in the construction is replaced by Calcium (2% approx). The benefits are a more robust grid, low water loss and longer shelf life.