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The vast majority of passenger cars on the road today have a single large battery. Generally found under the hood, although some brands and models have the main battery in the trunk near the spare wheel. The work of this battery is simple: it supplies the electricity necessary to start the engine. The rest of the energy generated during operation to power the radio, signal lights and other accessories comes from the alternator.
However, some vehicles (especially European high-end imports) have more than one battery. There is a main battery under the hood, but also an auxiliary battery. These are used to power other systems in the car that require 12 volts of power and cannot directly power the alternator. In these cases, the alternator is responsible for charging the primary and auxiliary batteries. The main battery provides power during the starting process and the auxiliary battery powers some or most of the vehicle accessories.Like all batteries, the auxiliary batteries may wear out or fail and should be replaced on regular intervals.
Your battery will deteriorate over time and with normal use. At some point it will fail completely. Most have a lifespan of around five to seven years, but this is only an estimate. Once your backup battery fails, it puts pressure on the rest of your system and some of the accessories may or may not work properly. Have one of our experienced mechanics professionally diagnose the problem because the electrical problems can be caused by many different problems, not just a battery failure.
While a faulty auxiliary battery will not prevent your vehicle from driving, this can lead to serious complications, including important accessories that do not work properly or do not work. You can also apply additional pressure to the other components of your charging system. Have the auxiliary battery replaced as soon as possible.
Replacement of the auxiliary battery depends on the make, model and type of auxiliary battery used on the vehicle.
A typical mid-priced brand like Ford, Fiat, Hyundai, Honda, peugeot, vauxhall , Lexus, Alfa Romeo, Mercedes , BMW,or hyundai can cost between £ 90 and £ 190 at an authorized dealer.
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