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This is just a guess, but a stronger charger might allow the car to get pass what ever it does while requiring the high current to get it to shut down and let the charger charge the battery. Notice the sudden change in both current and voltage at about 1 minute in my plot. After that the charger keeps the voltage at 14.1V and the current gradually decreases as expected (the battery was not discharged). The voltage when the current was high was not remarkably high so I beleave that the current was consumed by something else than the 12V battery. And yes CTEK specifies it for "12 V: WET, MF, Ca/Ca, AGM, EFB, GEL, LiFePO). The same for CTEK PRO25S which I assume should work for you.
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