Group 78 Vs 75 Battery: All The Differences Explained

Group 78 and 75 batteries have many differences and their uses are different too. But what are the main differences of these two group batteries?

There is definitely a difference in the dimensions of both of these batteries. And then comes the other factors such as voltage, amp, and compatibility among others.

In this article, I’ll discuss everything you need to know about the differences between group 78 vs 75 battery.

Group 78 Vs 75 Battery: Quick Comparison Table

There are several key differences between a group 78 and 75 battery. I will provide a table below, listing some of the common distinctions between them.

Let’s take a quick look at them.

DifferencesGroup 78 BatteryGroup 75 Battery
Dimensions (Inches) (L x W x H)10.25 x 7.0625 x 7.31259.0625 x 7.0625 x 7.3125
CCA Range (Cold Cranking Amps)465 – 875620 – 760
Best Used forOne of the most common batteries used in cars, trucks, and the light industry.Can supply backup power even when the main engine is turned off.
Similar Battery GroupsGroup 25 Batteries Group 86 BatteriesGroup 24 Batteries Group 34 Batteries
Cost$100 – $180$100 – $160
Durability3 – 106 – 10

What Are the Differences Between Group 78 and 75 Battery?

I have showcased some of the key distinctions between these two battery sizes in the above table. I will discuss these features in detail below.


As the above table shows the dimensions of both of these battery sizes, it can clearly be seen that a group battery size 78 is longer in length than a group 75 battery.

But a group 75 battery is similar to a group 78 battery in both width and height. So, where does that leave us?

There is no good or bad when it comes to dimensions. You have to choose the one which will fit your vehicle. That is the only concern you should have regarding battery dimensions.


A group 78-sized battery normally weighs around 17 kilograms to 23 kilograms. In terms of pounds, they weigh between 38 and 51 pounds.

On the other hand, a group 75 battery weighs somewhere around 15 kilograms to 20.6 kilograms. Or somewhere between 33.1 and 45.5 pounds.

Which makes group 75 batteries quite a few pounds lighter than a group 78 battery. So, in terms of weight, group 75 is the winner.

CCA Range (Cold Cranking Amps)

Group 78 batteries tend to have a higher average rating for cold-cranking amps. Clocking in at around 465 amps up to 875 amps.

However, the average CCA range is around 620 amps to 720 amps for group 75 batteries, which is significantly less than a group 78 battery.

So technically, a group 78 battery has the potential to provide you with better power in colder weather than a group 75 battery.

Best Used for

BCI group 78 batteries are frequently used in ‘Stop-and-Go’ automobile applications, which need the batteries to deliver huge currents frequently and be recharged fast.

And group 75 batteries are able to easily crank gas and diesel engines and still be able to power other devices when the main engine is offline.

Similar Battery Groups

The physical dimensions of a group 78 battery are very similar to several other battery groups, allowing these batteries to be used almost interchangeably. Which are group 25 and group 86 batteries.

On the other hand, group 24 and group 34 batteries tend to be similar and interchangeable with group 75 batteries.


Group 78 and 75 batteries tend to have a pretty similar price range.

If you look properly, you may find a battery of both sizes with the same price tag.

So, price isn’t an issue in terms of these two battery sizes.


Group 78 batteries do have a pretty long-lasting life if maintained properly. They can serve you up to 3 to 10 years.

However, on average, you will get better service out of a group 75 battery, which can last well over 6 years, even up to 10 if you’re lucky enough.

So, in terms of durability, group 75 is the clear winner.

Group 78 or Group 75? Which is the Best for You?

To be honest, most of it comes down to personal preferences as well as the vehicle’s battery compartment. Let’s simplify.

If your battery compartment has enough space for a battery of either group size, you can choose any of them.

It is common for GM, Chrysler, and Dodge to be compatible with both of these battery groups.

But in the end, it comes down to your specific car model and the size of your battery compartment.

So, there are no clear winners. However, it is always best to choose a battery of a slightly smaller size.

Because it eliminates the risk of the battery not fitting in the compartment. So, a group size 75 battery should be your best bet.

My Recommended Group 78 and 75 Batteries

As a buyer, you may feel overwhelmed with which battery to choose from, as there is a huge list of available batteries. So, I’ll provide you with a suggestion.

Group 78 Batteries:

ACDelco 78AGM

– Enhanced life alloy increases cycle life and improves performance.

– Vent cap design that resists acid leakage.

Delphi BU9078 MaxStart

– Superior corrosion resistance sealed housing.

– 20x the vibration resistance of conventional batteries.

Odyssey 78 PC1500

– Recharges faster than other competitors.

– Extremely vibration resistance and high mounting flexibility.

Group 75 Batteries:

Delphi BU9075DT MaxStart

– Designed to perform in extreme temperatures.

– A battery with 680 CCA and 100 R.C. (reverse capacity)

Optima 8022-091 75/25 RedTop

– Reserve capacity of 90 minutes for constant performance.

– Fifteen times more resistant to vibration for durability.

Frequently Asked Questions (FAQs):

u003cstrongu003eCan I Choose a Battery of a Bigger Size?u003c/strongu003e

No, it is highly advised against. You should not select a battery size that is bigger than your battery compartment.

u003cstrongu003eHow should I know which size is right for my car?u003c/strongu003e

Look at your old car battery before replacing it. It should have the battery size written on the side of it.

u003cstrongu003eHow to tell when a battery needs to be replaced?u003c/strongu003e

If your dashboard’s “check engine light†comes on, it may be a sign that the battery needs to be changed since its power has been depleted.

u003cstrongu003eHow to dispose of old car batteries?u003c/strongu003e

Car batteries should always be recycled. Most retail outlets and repair facilities will accept your old battery for recycling, such as Walmart.


Throughout this article, I have discussed the differences between group 78 vs 75 battery, so that you’ll be able to take a proper decision on which battery size to choose.

The battery group is an important factor to keep in mind before getting a replacement. Any misjudgment or wrong decisions can cost you a lot of money. So, it is necessary to know the distinctions between different battery sizes.

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