An auxiliary battery is a battery that provides additional power to a vehicle when the engine is not running. It can be used to power systems and accessories that require 12 volts of power, such as the lighting, navigation, stereo, and computer controls.
Auxiliary batteries are often found in vehicles with start-stop technology, which shuts off the engine when the vehicle is idling. This feature is intended to reduce fuel consumption and CO2 emissions.
Auxiliary batteries can also be used in other types of vehicles, including:
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Hybrid and electric vehicles: Auxiliary batteries work alongside the high voltage battery in these vehicles.
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Off-road and overlanding vehicles: Auxiliary batteries power lights, winches, and other off-grid essentials.
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Recreational vehicles (RVs): Auxiliary batteries provide backup power for appliances and lights.
Auxiliary batteries can vary in size and specification depending on the vehicle's electrical system. They typically last between 5 to 8 years, but this can vary depending on the vehicle and how well it's maintained.