What Is An Auxiliary Battery and Does My Car Have One

Dear car fans! Did you know that automotive technology has experienced significant progress, and vehicles are becoming increasingly advanced, integrating a wide variety of accessories and electrical components? In order to supply these additional accessories and systems, many modern high-end cars are equipped with an inconspicuous little guy – the auxiliary battery. It is the little guy who is usually unknown but can play a huge role at critical moments! Today, let us unveil its mystery together!

Introduction to AGM Car Auxiliary Battery

The auxiliary battery, also known as the second battery or auxiliary power source, is an important configuration in modern cars, especially in high-end models equipped with many electronic devices and technologies. The auxiliary battery is usually a 12V battery, but it is the backbone unit of the system, supporting the normal operation of the vehicle. The existence of the aux battery is essential to ensure the reliability of the vehicle and enhance the driving experience.

       Definition and Basic Functions

The basic function of the auxiliary battery is to provide independent power support for the vehicle’s electronic equipment, especially when the main battery or engine is turned off. It can ensure the continuous operation of the central control system, interior lighting, audio, navigation and other equipment, and at the same time, serve as a backup power source when the main battery is low on power or fails, keeping the basic functions of the vehicle unaffected. This allows the vehicle to operate stably in various states, improving the safety and convenience of vehicle use.

       Application of Auxiliary Batteries

Traditional fuel vehicles: In traditional fuel vehicles, the auxiliary battery is mainly responsible for powering non-critical systems such as entertainment systems, doors and windows, and lighting systems. The power requirements of these devices are not high so that the auxiliary battery can meet their operating needs well.

New energy vehicles: New energy vehicles are usually equipped with a power battery to provide power for the power system. However, devices such as vehicle starting, dashboards, and driving computers require a stable 12V, and this is when the aux14 battery comes in handy. It not only powers these devices but also provides support for the power battery at critical moments.

JYC Battery 12V AGM Auxiliary Battery

1. Extend cycle life: The auxiliary battery uses advanced electrochemical materials and optimized design, and can maintain good performance after multiple charge and discharge cycles. Compared with traditional batteries, the auxiliary battery has a longer service life and can provide stable power output for a longer time, without frequent replacement, thus reducing the long-term use cost.

2. Low self-discharge rate and long life: By optimizing the electrolyte formula and electrode structure, the auxiliary battery has a lower self-discharge rate and can maintain a good power state even if it is not used for a long time and has a long shelf life.

3. Reduce the risk of battery failure: The main feature of the aux14 agm battery is that it serves as a backup for the main power supply. When the main power supply fails, it can quickly restart and supply power to ensure the continuous operation of key equipment or systems.

JYC Battery‘s auxiliary battery has undergone 3 days and 4 nights of charge and discharge testing, internal resistance testing, high current detection and other testing work to ensure factory quality, which is your only choice.

How Does an Car Auxiliary Battery Work?

The car auxiliary battery works like a large capacitor, which can effectively absorb instantaneous overvoltage in the circuit, thereby ensuring voltage stability and protecting power equipment from damage. At the same time, it can also act as an energy buffer to provide additional power support when power demand suddenly increases.

      Differences from the Main Battery

1. Functional positioning:

Main battery: In new energy vehicles, the main battery is usually a power battery. It is the main power source of the vehicle and is responsible for driving high-power equipment such as motors and air-conditioning compressors.

Auxiliary battery: It is mainly responsible for the power supply of non-power power sources, such as entertainment systems, doors and windows, lighting systems, etc.

2. Performance requirements:

Main battery: It needs to have high energy density, long life, high safety and other performance to meet the long-term and high-intensity power requirements of the vehicle.

Auxiliary battery: Although the requirements for energy density are relatively low, there are high requirements for its deep discharge recovery ability, voltage stability and other performance to ensure the normal operation of electronic equipment in the car.

3. Installation and maintenance:

Main battery: It is usually installed at the bottom of the vehicle or a specific location and requires regular maintenance and inspection to ensure its performance and safety.

Auxiliary battery: It is usually placed in the engine compartment of the vehicle, keeping a certain distance from the main battery, and its installation and maintenance are relatively simple.

      Reasons for Using Auxiliary Batteries

Providing additional power support: In the event of a failure or depletion of the main battery, the auxiliary battery can ensure that the vehicle can continue to drive in an emergency, giving the driver extra time to respond.

Protecting electrical equipment: The auxiliary battery can effectively absorb instantaneous overvoltage in the circuit, thereby ensuring voltage stability and protecting electrical equipment from damage.

Improving driving experience: The auxiliary battery provides stable power for electronic devices such as the entertainment system, doors and windows, and lighting systems in the car, ensuring their smooth operation, and thereby improving driving comfort and convenience.

Does My Car Have an Auxiliary Battery?

Some cars only have one main battery and do not need an auxiliary battery. So, how do I determine whether my car needs an auxiliary battery?

       How to Identify

Check your vehicle manual: Your vehicle manual will usually detail your vehicle’s battery system and configuration, including whether it has an auxiliary battery.

Check the vehicle structure: Some vehicles may have an auxiliary battery installed in a specific location, such as in the engine compartment or the trunk. You can look closely at these areas to determine if an auxiliary battery is present.

       Vehicle Types with AGM Auxiliary Batteries

As an important power supplement device, automotive auxiliary batteries are widely used in many luxury car brands, including Jaguar, Land Rover, Mercedes-Benz, and BMW. In these luxury models, the core role of the 12V Car battery is to provide reliable backup power for the electronic induction brake system to ensure the normal operation of the brake system in an emergency. In addition, it also provides necessary load support for environmentally friendly emission reduction models that use micro-hybrid technology, further optimizing energy utilization and improving overall efficiency.

What services can we provide for you?

Car owners always want a trusted and reliable expert to check their cars for damage and problems. We understand this, so we have a team of experienced experts who can accurately and quickly diagnose your battery problems. If your auxiliary battery has a problem, whether it is low power, performance degradation or fault alarm, we can provide professional consultation so that you can enjoy a worry-free driving experience.