Storage and Transfer
![]() Auxiliary and Back Up Batteries explainedAuxiliary Battery Overview Modern vehicles with CO2 reduction technologies, high levels of specification, and new electronic driver aids may feature an auxiliary battery alongside the main vehicle starter battery or high voltage system battery on Hybrid and electric vehicles. Auxiliary batteries vary in size and specification dependent on the demands placed on it by the vehicle electrical system and can be used as a safety back-up to support the main battery when required or to provide voltage for specific vehicle systems all of the time.
Internal Combustion Engine Auxiliary Battery
As this system relies on electrical power and a minimum system voltage to apply the brakes the vehicle is equipped with an auxiliary battery as a safety back-up which becomes operational in the event of the main starter battery becoming too low or a charging system failure.
Hybrid Vehicle Auxiliary Battery
The 12 Volt battery is not used for engine starting or to power the traction motors but is used to supply power to: · Accessory systems · Headlights · Audio systems · Computer controls
Electric Vehicle Auxiliary Battery
The auxiliary battery is not used by the traction motor but is charged by the traction battery and is used to support all of the electrical systems on the vehicle with the exception of:
· Air conditioning · Heating system
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