H8 Vs H9 Battery: Which One Should You Get?

Both H8 and H9 batteries are popular among car owners for their huge capacity to support almost every requirement.

Because of some differences in their specs and performance, I thought that writing an H8 vs H9 battery comparison will help you choose the right one.

In this article, you will get to know about these battery types and some product suggestions.

H8 vs H9 Battery: 5 Differences to Consider Before Replacing the Existing One

Some of you might be thinking of changing the existing H8 battery with an H9 battery. But don’t do it yet without knowing all the differences.

It is possible that your vehicle doesn’t support H9 or group 95R batteries. Don’t skip the points I have described here and take the right decision.

1. Difference: Group Size

Don’t think that H8 or H9 indicates the BCI group sizes. They are DIN codes. This identity system is popular in Europe.

On the other hand, BCI or Battery Council International assigned numbers and letters for each group size is popular in the US.

The equivalent of H8 is BCI group size 49. Similarly, the BCI group 95R represents H9.

2. Difference: Dimensions

The first big difference between these two is in the dimension. Firstly, group 49 or H8 batteries are 15 x 6.875 x 7.1875 inches in size. On the other hand, group 95R or H9 batteries are 17 × 13 × 13 inches.

You can easily understand the huge difference in their dimensions. Logically, a larger size means more capacity. However, it doesn’t indicate a higher CCA rating. The main concern is compatibility.

Check your car’s or truck’s owner manual to see which group sizes are supported. If you are a boat owner, it will be much easier because size won’t matter much. For boats, other features are more important than dimension.

3. Difference: Terminal Positions

The orientation or position of the terminal is the same in both H8 and H9 batteries. After seeing several products in each category, I have noticed a difference.

Almost all of the group 49 or H8 batteries come with an SAE automotive battery terminal, and some have M6/M8 bolts. And, the opposite is true for H9 batteries. 

4. Difference: CCA Rating

CCA rating indicates how well a battery performs in cold weather. A higher rating means that you can rely on it even in the coldest weather conditions.

After going through the specs of these batteries, I have seen that both group sizes come with similar ratings. It is around 850-900.

5. Difference: RC Rating

What I have said in the previous point is also true for the reserve capacity of these batteries. You can expect something between 110 and 180 minutes.

The information you are seeing is an average of the existing products’ specs. So, there are a few H9 battery models that are capable of providing more than 180 minutes of reserve capacity.

Which Group Size Deep Cycle Battery Is Better: H8 or H9?

If you consider power and capacity over other factors, H9 will surely be on the top of this comparison.

But taking other parameters into account, both group sizes have equal chances to be the best in their application.

All you have to do is know the requirements of your vehicle and choose accordingly.

Those who can fit an H9 battery into the battery compartment should go for it. Below I have suggested some popular models so that you can buy one right now.

What Is the Best H8 Battery?

1. Best Overall: Odyssey Battery 49-950

Vehicles nowadays come with lots of electronic accessories. To support such a high-power demand, you should buy an Odyssey 49-950 Battery which has 99.99% pure lead flat plates. 950 CCA rating makes it perfect to use in cold weather with full confidence of starting the vehicle.

2. Runner-Up: Deka 9A49 AGM

Besides the ability to provide a huge amount of voltage for starting an engine, Deka 9A49 is also known for its high resistance against vibration. If you own a heavy car such as an SUV, BMW, or Audi, you will love this battery’s performance. I particularly like encompasses oxygen recombination technology which ensures more endurance and cycle life than competitors. To know more about the company, you can read who makes Deka batteries.

3. Best Budget: ACDelco 49AGM

I like the fact that you can mount it in any position making it convenient for car or truck owners. Also, the build quality is so good that shocks or vibrations can’t do any damage to it. Because of using a negative paste, you can expect more life and better performance compared to the competitors.

What Is the Best H9 Battery?

1. Best Overall: DieHard Platinum AGM

Among many reasons, I like this battery for its capability to support the Start-Stop technology of a vehicle. According to the manufacturer’s specs, it can exceed the starting voltage, reserve capacity, and power requirement of your vehicle. Know what other users are saying about this AGM battery and order with full confidence.

2. Runner-Up: Interstate MTX-95R/H9

Utilizing cutting-edge AGM technology, Interstate has ensured a 950 CCA rating in this model. It has superior starting power along with enough capacity to run all accessories in your vehicle. Its mounting flexibility has proven to be very useful. Give it a shot.

3. Best Budget: Duralast Battery H9-DL

Indeed, you can’t get the top ratings like the previous high-end AGM H9 batteries. For example, the CCA rating of this one is 850 and has only 140 minutes of reserve capacity. Also, the warranty period is 2 years. However, by comparing those features with the price tag, you will know that it is a good deal.

Frequently Asked Questions (FAQs):

u003cstrongu003eIs H8 The Same As 49?u003c/strongu003e

The dimensions of both group 49 and H8 are the same which is why they are interchangeable. However, there are some small differences among them. Try to know those variations before deciding to use one instead of the other.

u003cstrongu003eIs H9 The Same As 95R?u003c/strongu003e

You can see the u003ca href=u0022https://www.jegs.com/Sizecharts/bcigroup.htmlu0022 target=u0022_blanku0022 rel=u0022noreferrer noopener nofollowu0022u003eu003cstrongu003echart of BCI battery groupsu003c/strongu003eu003c/au003e and notice that both Group 95R and H9 has the same dimensions.

u003cstrongu003eHow much does a H8 battery weigh?u003c/strongu003e

As the weight varies from brand to brand, it is hard to give you an exact value. The average weight of H8 batteries is around 60 pounds.

u003cstrongu003eHow much does H9 battery weigh?u003c/strongu003e

As H9 or 95R batteries are slightly bigger than H8, they weigh slightly more. On an average, they are around 65 pounds.

u003cstrongu003eIs it OK to put a bigger battery in your car?u003c/strongu003e

Most of the modern vehicles come with a very tight battery compartment. As a result, installing a bigger battery in your car or truck may cause some problems. For boat owners, it won’t be much of an issue.


So, that is all about H8 vs H9 battery comparison. For the next battery-changing schedule, which one are you going to choose? Let me know in the comments.

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