Backup Battery And Low-Voltage Disconnect

Posted on 06 August 2025 Print

When an accident happens, how will you call for help? Maybe the telematics system, equipped with a backup battery, could automatically do this, even if the main power is cut off. What are the repair considerations, and where can information be found for backup batteries?

Backup batteries, sometimes referred to as auxiliary or supplemental batteries, are important in maintaining power for certain vehicle systems even while the 12-volt or low-voltage power is disconnected. The backup battery aids in maintaining power to specific systems for emergencies or customer convenience.

These batteries are not to be confused with vehicles with more than one battery, like hybrids, heavy-duty pickup trucks, or luxury vehicles. These types of backup batteries are often part of another module or part.

Typically, the backup battery cannot be recharged and must be replaced if depleted. Which is why it is important to know whether the vehicle being repaired has a backup battery for a certain system and how to properly disconnect the main low-voltage battery prior to repairs.

This series will explore where to find OEM vehicle-specific information and emphasize repair considerations for backup batteries. The following articles cover vehicle makers that have considerations for the backup battery:

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