How Much Does a Car Battery Weigh?



Have you ever wondered how much does a car battery weigh?’. We’ll assume you have, hence you are on this aptly titled page. Of course, as you can imagine, the answer is not that simple, as there are several things that you can take into consideration if you want to have the full answer.

If you are wondering if the weight matters, the answer is that, yes, it does, which means that you need to pay extra attention to it when you buy a new one or when you remove the old one and put the new one in. If you choose to ignore this, you may end up spending some extra money later on.

For example, if you own a heavy car and you expect high performance from it, you would be entitled to, but only if the right kind of battery is attached to it. Otherwise, you will find out that the car is not as strong as you thought it would be, and that will only happen because you chose to ignore this feature.


The types of batteries

As you can imagine, a battery that is full is going to weigh a bit more than one that is empty – sometimes, a little bit more. The vast majority of the weight that you find in a lead-acid battery comes from the liquid that is generating the charge. An empty one can weigh just 15 pounds, while a full one can go up to 40 pounds or more.

For you to be able to really understand what the impact that a battery can have on a car is, you should first know about what different kinds of batteries are out there, especially if you buy a new car or a new battery. Being informed is the best way to ensure that you get the best results.

By these criteria, we will talk about the empty battery first. A battery can be pretty heavy by itself, especially when it’s charging, but if it were to be empty, it wouldn’t weigh more than 15 pounds. This value is, as you can imagine, on average, and for standard core batteries, as there are quite a few differences out there.

For example, if we were to talk about lightweight battery models, then the weight may get to just around 7 pounds, sometimes even less. This can make a world of difference, as you can imagine, especially when you have to change it, as 15 pounds suddenly sound much heavier when there is a 7-pound option out there.

The standard battery can weigh anywhere between 40 to 60 pounds. Suddenly, that 15-pound one sounds light as well, doesn’t it? You should keep in mind that these numbers rely on different aspects, such as the carload, the weight of the engine, plus the total amount of components.

If you are interested in a cool little tip that we can offer you – when you are thinking of buying a new car battery, we recommend that you check the specs of it. This is a great way of realizing if you will get the one that is truly compatible with your car, so you won’t have any unpleasant surprises afterward.

But what about the lightweight batteries that we mentioned? If you would like a really good performance from your battery, in the case that you own a small car, you can buy a lightweight one. These types weigh around 10 to 20 pounds, they are much smaller in size and you can remove them and install them with ease.

When you do go out and consider buying a car battery, you should keep in mind that this purchase ought to happen, not basing your opinion on the size of the battery or, even less so, on the price it has, but mostly on the minimum power that your car requires from such a device in order for it to work properly.


Why are car batteries so heavy?

In many cases, the weight of the battery is going to be mentioned on the label. Before you start looking anywhere else, look there and you may find the answer. Still, in some cases, there are batteries that don’t have that printed there or anywhere else, for that matter, so a little bit of research will be needed.

When you’ll try and lift a car battery, you will instantly think about how heavy it is and how it’s probably made out of lead! You may have said that half-jokingly, but you would actually be right. The main ingredients of a car battery are lead plates and water-based electrolyte solution, which you may know better as battery acid.

Both the battery acid and the lead plates are really heavy and really dense, which is why they make the product weigh so much. Let’s say inside a classic 12 volts battery you’ll find 6 chambers with individual cells. All of these cells contain some thin lead plates that are dipped into battery acid.

What you should know about the electrolyte solution is that it’s 30 – 50% sulfuric acid in a water base; the chemical formula for it is H2SO4. That may not help you in your day to day life, but it can be an interesting piece of trivia to know. Aside from these two main ingredients that we’ve talked about, there are two more we can mention.

Since a car battery is just an outer case that has inside various materials that have one goal, to convert the chemical energy into electrical energy, one of the materials that are a part of it is, of course, the polypropylene outer case. A rather obvious one, wasn’t it? In the case of advanced AGM batteries, there are also fiberglass mats.


More info for you

Naturally, there is so much more to know about car batteries, that you may not even think of asking. For example, you may see some models that have the same BCI number, yet, do they have different power ratings? Can they have different weights? Let’s take a look at these questions and see what we find out.

Why, yes, of course! Basically, just about any car battery has 12 volts, yet they are able to supply different amperages. If you want to increase the power, you just need a bigger quantity of lead plates. If you have more lead plates, the chemical reaction will be bigger, and more electrons will be produced.

Naturally, you have to keep in mind the fact that if you do add some more plates to your car battery, you are going to make the device weight a little bit more. That depends a lot on the weight the product had initially, and how many plates you add to it, so we can’t give an exact number, in this case, as there are too many variables.


Does the size matter?

The size of a car battery and its weight are considered to be the most important factors, simply because a big battery is going to have a much higher capacity, thus offering your car a greater level of power. A big engine goes, usually hand in hand, with a big battery, as well. The sizes of these products can vary.

The type of battery that your car has will also have a partial impact on its general weight. Check out the battery of an Accord Hybrid, which weighs just about 28 pounds. This happens because of two things: the car is a smaller one, true, but the chemistry of the battery is also important.

In this case, we are talking about a hybrid battery. When discussing hybrid batteries, it’s important to know that these are usually Lithium-ion batteries, or something similar, which is quite a difference from the classic lead-acid battery. One of the main differences is felt in the fact that hybrid ones will weigh less than the lead-acid ones.

If you have some concerns regarding the general weight of the battery you plan on using, a lightweight battery is a really good option that you can seriously take into consideration if you own a small car. In this case, the weight inside the engine can impact the performance, so of course, you must keep that in mind.

With any kind of car battery that is out there, you should know that a model that is on the lighter side is also going to come with less power, so that may be important to you. Verify the CCA rating of the battery you are interested in so that you will be sure that what you are buying is going to be enough for your vehicle.

Bottom line, the weight of a car battery can vary a lot, depending on the model and if it’s full or not, but the most important aspect is to find out how much power the battery can give and how much power your car needs in order to run as smoothly and as fast as it can possibly go. Some research can go a long way!