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How To Wire Multiple Batteries For Car Audio - Get it right!

How To Wire Multiple Batteries For Car Audio - Get it right!

Every car, No matter if it runs on gas or diesel, has a battery. The battery is the power bank for your vehicle and stores energy that you need to start up the engine but also provides a zap of electricity whenever necessary. With electrical components working. A different feature called “the alternator” takes care when charging this vital resource, inside every modern-day marvel known as an electric engine.

In some cases, one good ol’ fashioned phosphate acid-based chemical isn’t enough, though. In these situations, high-performance cars require even more than just juice stored away inside those 12 volts – because they’re always running into low voltage zones where their output requirements exceed what can easily be provided.

If you are expecting more power when the engine is turned off, whether for a powerful car audio system or anything else, the best solution is to use an auxiliary battery.

Do I Need an Extra Battery for Car Audio?

The short answer is yes. The reason for this in most cases is because car electrical systems, in general, are NOT designed, so one battery in the front supplies power to all of the different electrical parts in your vehicle. So, for example, when you turn on your headlights, you might assume that it’s just a matter of flipping a switch and BAM! There they are turning on instantly.

However, if you were to go under the hood later after driving around with them on, you’d notice that they’re not just magically turned back “off” either. How do they work when the engine is off but running?

This is a highly simplistic explanation, but essentially what is going on in your vehicle when you turn on a switch or even roll down a window? Whether it’s electronically controlled or not, all power goes to wherever it needs to go from the battery. In this case, electricity flows from the positive terminal of one battery to another through some wiring that connects them both into the car electrical system.

Whether you require extra auxiliary batteries for car audio or any other reason that might need two sources of charge for this purpose has everything to do with how large your amplifiers are and what kind of music you’re listening to. To keep things simple again, let’s assume that your subwoofers are drawing 200 amps each at a max volume which is a considerable amount. So, in this instance, you would need a system with at least 400 amp-hours of battery capacity to power them for even an hour continuously when the engine is off.

In other scenarios, however, let’s say that your car audio amplifier only draws 50 amps per. If that is the scenario, then you could get away with two batteries rated at 100 each since they’re both charging and un-charging from one another simultaneously while you’re driving along. How?

Well, there are different strategies such as using a large combination of multiple small batteries or having just one larger battery, but what matters most is essentially how much current it can supply on-demand. And whether it will stand up to the test of time so having the best car battery brands to perform this task if you want to get the most out of your audio system.

How to Safely add a Second Battery for Car Audio:

So, if you’re ready to install your 2nd (or 3rd) battery for this purpose and want to learn how right now, here’s what you need to do:

1. Choose the location for your second battery.

No matter whether the majority of people choose to mount this extra battery on top of their vehicle. Or along some other section of their car, there are several different things that you should consider first. Which include the size being compatible with where it needs to be placed into your vehicle plus any special wiring that might be required for hooking everything up inside.

Beyond those critical factors, however, one of the essential aspects involves planning, so think about getting a larger model than you intend on at first just in case you decide to upgrade your subwoofers again.

2. Buy the right size battery for your system.

A critical component that matters regardless of where it is placed inside your vehicle consists of the size that’s capable of powering large amplifiers for extended periods before each one requires recharging.

Which can be extremely difficult if they’re underpowered, to begin with since these motors require so much more than any other electrical components on your car. So, whether you’ve chosen a lightweight 12-volt model or something more heavy-duty like an 18-volt deep cycle battery made specifically for this purpose.

3. Plan ahead for installing a second battery.

Suppose there’s anything that you should take from this article. In that case, it is planned because if you don’t, then it can cost you a lot of time and money later on. Especially with your car audio system, which is one of the most expensive upgrades that most people buy these days. So, as a general rule of thumb here.

Do not wait until the battery is completely drained before even thinking about getting a new one which will be sure to run out at some point when using very high-powered amplifiers. It would help if you continued driving off an alternator or another vehicle since they’ll still hold a charge and aren’t as quickly drained as ordinary batteries would.

Read more: Test an amplifier with a multimeter. 4 channel Amp vs 5 channel Amp

4. Use the proper wiring to connect your extra battery.

There are several different ways that you can wire this new one into your car audio systems, such as using series or parallel connections, which make it easier for you depending on which type of batteries you choose, having either positive and negative leads coming out of them or simply a set of jumper cables which don’t include those. But they still both essentially do the same thing.

So, if you’re not sure how to wire a second battery inside your truck, then go online and search for some specific instructions. Since there’s no reason why you shouldn’t have everything hooked up correctly with the correct amperage at all times.

5. Last but not least, secure everything in place with the right products.

Suppose you’re going to be placing this extra battery out of sight and mind underneath your vehicle. In that case, you’ll need to make sure that it’s completely secured and protected from constant bumps and jostles.

Because even though they’re generally smaller than most primary batteries, they can still cause a lot of damage if they move around too much.  

Using a New Battery with Your Current Battery:

If you ever buy an expensive battery, you may not want to go with the cheap alternators on your vehicle. Many different factors determine how long the new battery will last in your car. The first thing is making sure that the engine of your car gets proper maintenance.

It can hamper your ability to drive far distances without needing a jump-start yourself when this isn’t done. It also means that even if the charge does run down on your original battery, you can still use smaller cars until your charges back up again.

This isn’t recommended for larger vehicles, though, because they often take more time to fully charge, which could make things difficult since most people rely on their large trucks or SUVs every day for work and other commitments.

It can help if you also make sure that the alternator is working correctly on your car. An old or failing alternator can put a fair amount of strain on every system in the vehicle, which means both batteries are affected more.

Even if you use your car more often, it means you’ll be more reliant on replacing parts sooner than expected since they don’t work as efficiently as new ones do. It’s essential to have at least the battery checked out thoroughly before purchasing something like this.

So that you know what you’re getting into instead of being caught off guard with higher repair bills later down the line. Since you only have one battery, there is no risk of backflow occurring between them, but if it was two separate batteries, it could cause power problems that are difficult to address.

How Long Can My Car Battery Survive When the Engine Is Off?

Batteries aren’t something that most people think of regularly, but everyone has to deal with them daily or even hourly. No matter what you’re driving and how good your vehicle is, there’s no avoiding the fact that batteries are an essential part of our day-to-day lives. It has led to some fundamental questions such as “How Long can My Car Battery Last?” After all, if we all rely on these power sources every single moment of our lives, then we deserve to know as much as possible about them.

There are dozens of different reasons why your car battery may be dying. And it could easily take hours or days before anyone will have enough time to figure out the actual source of the problem. To make things even more complicated, it could be a specific part of your vehicle that is acting up rather than it being a battery issue at all. Either way, you should learn as much as possible about your car’s batteries and how to keep them going for many years to come.

What Causes Car Batteries to Die So Quickly?

The following reasons are why car batteries die fast:

Driving a car with a lousy alternator:

 If this isn’t fixed right away, it can cause quite an amount of damage in just one day if not done quickly enough. This is because the alternator could put too much strain on every single system in your vehicle. Even if the car is running fine, it might not be since a lousy alternator can make all of your lights dim and limit the amount of time you have until everything entirely runs out. The battery is designed to run a vehicle for a certain number of miles but won’t do so if the alternator isn’t doing its job correctly.

Driving on Rough Roads: 

While this may cause damage to other more noticeable components at first glance, it also damages batteries due to excessive vibrations from bumps in the road.

That means that even if the car is working perfectly fine before taking a drive, you could end up with some severe problems on your hands later on down the line. Smaller cars are more likely to be affected since they don’t have the most durable frames in the world. While most drivers won’t think about this before driving, it can cause problems with your vehicle that you never expected in just one day.

How Can You Keep Your Car Battery Last Longer?

The best way to keep your car battery lasting longer is by having routine checkups on your vehicle’s overall health. Even if you’re not an expert at finding problems, there are plenty of others who can quickly look underneath the hood and determine what may be causing issues.

If you avoid getting anything checked out because it seems too complicated or expensive, then you could find yourself in more considerable trouble down the line. This means you’ll end up spending more money in the long run, which is never a good idea since car batteries can be very costly to replace if it isn’t done right.

Another way to keep your car battery lasting longer is by having an effective vehicle alarm system that alerts you if anything changes with the engine or other components.

While this might seem like something impossible, there are plenty of methods out there that will make sure you stay updated on everything without any problems at all.

This includes letting you know when the engine has trouble starting up or when something else may be wrong with your battery. Without these alarms, you’ll never even realize that there’s any damage being done until it’s too late, and that leads to another critical question.

The following are a few different signs that your car battery isn't going to last much longer:

It takes longer than usual for the engine to start up. If this doesn’t happen right away and it seems like there’s too much strain being put on other parts of your vehicle, then the battery might be having some serious issues that need to be looked into before you get stranded somewhere.

Although newer cars aren’t as likely to fail at any moment, they might take a while for the engine to turn over due to age or not being driven for too long without problems occurring.

Either way, it could mean that something is wrong with the starter, which is essential to look into as soon as possible before it gets worse.


In conclusion, all of these tips are sure to help make your life a whole lot easier when you’re going about installing your next car audio system where the best places to put a second battery can undoubtedly vary from person-to-person depending on their specific vehicle model and lead times that they have to get everything completed successfully. Which means that just because one person has a second battery placed somewhere doesn’t mean that everyone else will.

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