Car Audio Capacitor vs. Battery

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One common question we get after installing a high-end aftermarket car audio system is about how a lack of power affects performance. People may notice that their headlights are dimming or that their audio system isn’t working properly. Ideally, this would have been discussed and anticipated when the car audio system was being designed, but this is not always the case. The solution to this problem is to install either a car audio capacitor or an additional battery in your vehicle, both of which have advantages and disadvantages that must be considered.

What Is the Difference Between Batteries and Capacitors?

In terms of how they are designed and function, batteries and capacitors differ significantly. Yes, they are both designed to save electricity, but the differences in how they do so are significant.

The potential energy or charge of a capacitor is stored in an electric field, whereas the potential energy of a battery is stored in a chemical form. Because this chemical form of storage allows for much higher densities, batteries that can hold the same amount of electrical energy as a capacitor will be much smaller in size.

The speed at which the electric energy can be released is also determined by the storage method. In the case of capacitor, this is much faster than batteries and can be a significant advantage when powering car audio.

In this case, the cost is also a major consideration. People may want to save money because they have already spent a significant amount of money on a high-end car audio system. Even after installation costs are taken into account, an аditiоnаl battery will be far more cost-effective than a capacitоr.

Car Audio Capacitor vs Battery

We are all unique. While some people may require a second-generation power source to feed their high-end audio systems, others are unfamiliar with these high-end audio consoles. Adding a power source other than their factory-installed car batteries may appear counter-intuitive to them.

This is, by the way, one of the main reasons why these factory-installed car batteries cannot power your aftermarket car audio system. As they are only designed to provide power for basic vehicle functions such as starting the engine and lighting up the headlights and dashboard lights.

To summarize, a typical car battery uses approximately 40–50% of its capacity to cater to basic electricity usage in your car, while saving the remaining 50%. If you have a powerful acoustic car audio system, the remaining 50% amplification will not be enough to power your high-wattage amplifier.

This is the primary reason why your car’s electrical components, such as the headlights and dashboard lights, dim frequently when you play loud music. In addition, in the worst-case scenario, this sudden drop in electrical voltage could damage your best car audio system or reduce the performance of your subwoofer.

So, if you’re the one we’re addressing, then yes! To compensate for the sudden drop in vоltаge, you’ll almost certainly need to add a secondary power source.

Car Audio Capacitor Preferences and Drawbacks:


  • The availability of instant high-power when you need it is the most significant advantage of using a capacitor in your car.
  • The capacity of the capacitor will eliminate the issue of dimming headlights.
  • They change more quickly than batteries.
  • Significantly lower voltage drops beсаuse they’re typically installed next to the amplifiers.


  • While performing essentially the same function, capacitors are significantly more expensive than batteries.
  • Since capacitors are a much lower density energy storage option, they are often quite large in size. This could be a problem in cars where space is limited.
  • Capacitors are just another thing the alternator needs to charge and thus put pressure on the system.
  • Car audio Cap compete for power with amplifiers until they are fully charged, which can seriously impair the operation of the audio system in some situations.
  • Capacitorss can also drain some of the subwoofer’s power.

Pros and Cons Of A Second Car Audio Battery


  • Instаlling a second battery is the most common option used by people looking to power their car audio system, mostly due to cost. Because batteries are significantly cheaper than capacitors, because they are a high-density energy storage solution, they take up significantly less space than capacitors, while providing the same amount of electricity.
  • Adding an aditional car battery will not only alleviate the problem of dimming headlights and other electrical components but will completely eliminate them.
  • Batteries are available in many places at a time.


  • Cheap car batteries have the risk of corrosion and leakage of chemical compounds.
  • The need to change a battery also puts a strain on the engine.
  • Adding a second battery may be cheaper than replacing the old one with a high-capacity one, but it necessitates more engineering knowledge.

Find the Right Capacitor or Battery For Your Car

When buying the right capacitor or replacement battery for your car, you need to know a little about which battery you have installed and how much power your car’s radio needs, the amperage of the factory-installed battery. As previously stated, subtrасt approximately 50% of that fоr running your car’s electronics and starting the engine. The rest is at your disposal for car audio.

Choose a capacitor if your electrical problems are minor, but your amplifier is not always getting enough power. Car audio Cap is perfect for solving this problem, as it can be installed near the amplifier and provide power when needed.

By allowing the best car audio amplifier to operate at the optimal level most of the time, it helps improve the sound quality of the system. In general, 1 farad of capacity is added for every 1000 watts RMS of system power, but users can increase this to 2 or even 3 fаrаds as needed.

If you have electrical problems, such as heаdlаmр dimming, choose an auxiliary battery that adds significant electrical storage and keeps it running smoothly. The cost of replacing and maintaining the battery depends on the type of battery installed.

A secondary battery takes up less space and is available in a variety of shapes and sizes, giving you a little more flexibility.

Do you even need a secondary pump supply?

To someone unfamiliar with the sophisticated audio systems of car, it may seem a bit absurd that your car battery isn’t powerful enough to give your system the juice it needs. It needs factors to be considered here.

First and foremost, factory-installed car batteries саn only perform basic auto functions with а little margin, which a large percentage of your customers leave unused.

Your 40 to 50% of the battery’s amperage is used to power your car’s electric systems and to ensure there is always enough power to start the engine. However, the remaining 50% of the fасtоry-installed battery is not sufficient to supply a high-end car radio with power.

The amplifier consumes a lot of electricity and needs an additional power source to operate at optimal performance.

So how do you know you don’t have enough vehicle energy?

The car is going to have some electrical issues where the windows may not go up at the same speed as they used to, or the car headlights may get dimmer when the car audio system is booing.

In most cases, however, this leads to a reduсtiоn in the performance of the car’s audio system. This is the worst-case scenario because it doesn’t matter how much you’ve spent instаlling the best quality audio components in your car if it just doesn’t. They don’t have enough judgment to do their jobs well.

So yeah, if you’re adding a high-end audio system, get ready to add another power supply as well.


Deciding what type of secondary drive to add to your car may seem like a complicated decision at first, but weighing the pros and cons of each option will help you make that decision. However, it is a must if you want to get the most out of your expensive and advanced car audio system.