Emergency battery

WARNING: This page is about a different car, the 2013 BMW X5, 2012 BMW X5, and 2011 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.

The emergency battery will be installed from 03/2013.

The emergency battery is designed as a nickel metal hydride battery with 4.8 V and a capacity of 600 mAh. The emergency battery serves as a voltage source if the voltage supply of the vehicle for the Telematic Communication Box (TCB) is interrupted due to an accident for example. In this case, an emergency call can be placed and the connection to the emergency center maintained for at least 5 minutes independent of the voltage supply in the vehicle.

The Telematic Communication Box (TCB) monitors the emergency battery within the framework of an internal self-test after each start-up procedure. The emergency battery has a service life of at least 5 years. If the capacity of the emergency battery is exhausted to the extent that placing an emergency call can no longer be guaranteed then this is shown by a Check Control message (emergency call system fault!). A fault entry is also stored in the Telematic Communication Box.