Consequences of fitting the wrong battery for Start-Stop systems

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Start-Stop technology is a sophisticated technology, which enables cost saving for drivers and importantly environmental benefits. However, the benefits of the Start-Stop technology involve an increased load on the battery. Start-Stop can switch off the engine at every time the car comes to a stop and start it again when the accelerator is pressed or the brake released.

When Start-Stop is active, say waiting at traffic lights, the large number of electrical consumers still have to be supplied with electricity. The radio is on, a smartphone is being charged, and the air conditioning continuously provides the necessary cooling in the car. In spite of this, the engine must still be started by the battery when the traffic light turns green. To meet these requirements, innovative batteries have been developed especially for use in vehicles with automatic Start-Stop systems. The wrong battery ultimately could lead to unwanted consequences.

Consequences of fitting the wrong battery for Start-Stop systems

A conventional starter battery cannot meet the demands of a vehicle with an automatic Start-Stop system. This is true both for cars with simple Start-Stop systems and EFB batteries as well as for vehicles with advanced Start-Stop systems. These vehicles which are equipped with recuperation, the electricity which is generated by the braking process is stored in the AGM battery.

These are the possible consequences of using a conventional starter battery in a vehicle with Start-Stop:

Loss of warranty

The use of unsuitable or unapproved starter batteries in vehicles with start-stop will result in the loss of warranty. The driver or the workshop will be liable for all consequential damage and loss of function associated with the installation of an incorrect battery.

Loss of driving comfort

Ideally, the Battery Management System (BMS) detects the installation of an incorrect battery and adapts the Start-Stop system to the lower power of the battery in order to ensure that the engine continues to start. In case of doubt, comfort functions such as heated seats and other features are not available during a stop phase.

If the battery management system does not detect the installation of an incorrect battery and does not adjust the energy management accordingly, this can result in a considerable reduction of the service life of the battery.

Restricted Start-Stop functionality

Due to the incorrect battery the amount of electrical energy is too low which will lead to rapid deterioration of the battery and causes the Start-Stop system to rarely or even never switch off the engine. This causes increased fuel consumption and greater pollution.

Leaking battery acid

Battery acid may leak if the battery case bursts due to overload and electrochemical processes. A sudden escape of battery acid can cause a severe risk to health.

Use of the incorrect battery technology in a Start-Stop vehicle results in more rapid deterioration of the battery. Because of this, as a result of overload, in extreme cases the battery acid may also leak.

It is important to remember that an AGM battery must be installed wherever an AGM battery was originally installed! This is the only way to ensure that the vehicle functions as well as with the original component after the battery has been replaced. 

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