When it comes to start-stop car batteries, there is often a full confusion of assumptions and opinions. What is true now?

Time for expert information with real added value.

Start-stop is TOP, not FLOP!



There is talk of "special batteries", some think they are gel batteries and others replace a start-stop battery with a conventional wet battery - due to a false cost-consciousness or incorrect battery application. The motto is: "It can always be worse". Others think that the start-stop function has been permanently deactivated in the car, so that a start-stop battery is no longer necessary.

Our little ABC of start-stop now sheds some light on the subject.


1. What do the industry abbreviations AGM and EFB battery mean? The answer can be found here in brief and in more detail under the menu item "More articles on this topic" on place 1.

  • AGM (Absorbent Glass Mat): the acid is absorbed into the glass fleece and thus bound.
  • EFB (Enhanced Flooded Battery): the cycle-resistant starter battery with liquid electrolyte.


2. Automatic start-stop function permanently deactivated. Nevertheless, the use of a start-stop battery is still necessary? You can find out why in the next few lines and the comprehensive information below under the menu item "Further articles on this topic" on place 2.

  • Never install a conventional starter battery in a vehicle with start-stop technology that is equipped with an AGM or EFB battery as OE standard.
  • Not even if the automatic start-stop system is switched off for a short time or permanently, because the cyclical load caused by additional electrical or electronic consumers is enormous and leads to a flat battery in a conventional starter battery within a few months! Continuous operation in a partially discharged state (SOC State Of Charge at approx. 70%) alone is a guarantee for the premature failure of a conventional battery.


3. What happens when a conventional car battery is installed in a start-stop vehicle? Here is the short info and the full info below at position 3.

  • If a conventional wet battery is installed in a vehicle with start-stop technology, either by mistake - due to an allocation error - or due to incorrect cost awareness, a wide variety of faults and problems can occur:
  • Battery breakdown or total failure
  • Failure of the start-stop system
  • Failure of various vehicle functions
  • Trouble and loss of time
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