Best Battery For 6.7 Cummins Engine – Which Battery Will Best Suit Your Truck?

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During the last 30 years, many models have been fitted with a Cummins diesel engine, especially 6.7L Cummins.

If you happen to own such a 6.7L Cummins truck, such as Ram 2500 and 3500, you will need to replace the battery in it at some point. You could choose to replace like for like, but you may want to consider other batteries in its place. The same goes for those who own a Ford F-250 Pickup truck.

Below we take a look at what you should be looking for when it comes to replacing the batteries in your Ram truck with its 6.7L Cummins engine.

3 Key Features To Consider For Battery For 6.7 Cummins

1. What Size Battery For 6.7 Cummins?

When it comes to getting replacement batteries for a 6.7L Cummins engine, there are only two groups you should be looking at: Group 65 batteries, and Group 94R/H7 batteries

Group SizeDimensions (in)Dimensions (mm)Terminal Position
6512.1×7.5×7.6306x190x192Left positive
94R12.4×6.9×7.5315x175x190Right positive

Both of which are more than capable of providing the necessary power needed to get the engine of your truck started. Plus, it will provide sufficient power to additional electronics in your vehicle.

Difference in dimensions:

As you will soon notice, there is a difference in size between these two groups of batteries. The Group 65 battery measures 12.1 x 7.5 x 7.6 inches, while the Group 94R/H7 battery measures 12.4 x 6.9 x 7.5 inches.

Difference in terminal positions:

Another important thing you need to be aware of when buying replacement batteries for a 6.7 Cummins engine is the position of the terminals. The positive terminal on the Group 65 battery is on the left-hand side. In comparison, the positive terminal is on the right-hand side of a 94R/H7 battery. 

Suppose you decide to go with a larger battery, you need to check if the box into which it is placed will provide enough space. If not, you’ll either have to make some adjustments to it or replace it altogether.

Below is Group Battery Size for common 6.7 Cummins models:

Year/ModelGroup
2007 RAM Van65
2009 Ram Van65
2010 RAM Van 2500 & 350094R
2008 Ram94R
2011 Ram 2500 & 350094R
2012 RAM 2500 & 350094R
2013 RAM 2500 & 350094R
2013 RAM 2500 & 350094R
Year/ModelGroup
2016 RAM 2500 & 350094R
2017 RAM 2500 & 250094R
2018 RAM 350065
2021 Ram 2500 & 350065
2014 Ford F-25065
2018 Ford F-25065
2017 Ford F-35065
2018 Ford F-35065

Buy Group 65, Group H7/94R batteries here:

Group 65 Battery

Group 65 Battery

Group H7/94R battery

Group H7/94R Battery

2. How Many CCA Does A 6.7 Cummins Need?

When driving any truck fitted with the 6.7L Cummins diesel engine, you must fit it with hardwearing batteries. You can, if you want, choose to upgrade to ones with more CCA than the current ones provided in your vehicle. But make sure that you buy 2 of the same batteries when you decide to do this.

  • CCA range of group 65 batteries: 730 – 950 amps.
  • CCA range of group 94R/H7 batteries: 620-850 amps.  

These days’ batteries you can use in your Ram 2500 or 3500 truck can have between a 730 and 950 CCA rating. But it is best if you choose batteries for your vehicle that come with a CCA rating of 800 or higher. 

Vital if you happen to live somewhere that in the winter months, it can get freezing. You’ll find that most owners of such trucks will choose to fit theirs with batteries that come with at least an 850 CCA rating. The main reason for going for a higher CCA rating is that the 6.7L Cummins diesel engine needs more power to get it started.

Buy 1070 CCA, 850 CCA Batteries here:

XS Power D6500 1070 CCA Battery

XS Power Group 65 1070 CCA

AC Delco Gold 850 CCA 94R AGM Battery

AC Delco Gold Group 94R 850 CCA

3. Price

As you will soon discover, when you begin your research, the prices of batteries for use in any vehicle with a 6.7L Cummins engine vary. There are many reasons why the prices of these do vary. Typically you will find that batteries for vehicles will cost anywhere from $165 up to $395 or more.

Infographic for 6.7 Cummins Battery Buying Guide.

3 Best Group 65 Batteries For 6.7 Cummins

 Delphi BU9065 MaxStart
Delphi BU9065 MaxStart
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Odyssey 65-PC1750T
Odyssey 65-PC1750T
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XS Power D6500
XS Power D6500
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Customer Rating
4
4.6
4.8
Product Dimensions10.6 x 10.4 x 8.2 in11.8 x 7.2 x 6.8 in11.8x6.80x7.20 in
Terminal positionPositive leftPositive leftPositive left
CCA7709501070
RC150145174
Price ($)$260 - $280$290 - $300$390 - $400
Score8.598.5

Best Battery For High Vibration Environment

Delphi BU9065 Max Start 750 CCA

Delphi BU9065 Max Start 750 CCA

Are you someone who loves to spend a lot of time off the road in your truck?

So getting batteries with a high vibration resistance rating is crucial. This is why you should consider buying the Delphi BU9065 Max Start. It comes with 20 times more vibration resistance. It is vital if you take your Dodge Ram 2500 or 3500 off-road regularly.

This battery requires no need for you to make alterations to the battery box as it measures 10.6 x 10.4 x 8.2 inches and weighs in at just 47.5 lbs. However, this battery only has a 750 CCA rating but has a higher RC rating of 150. 

You need to be aware that this particular battery is prone to overheating. But you can reduce the risk of this happening. One of the best ways of preventing this from happening is to make sure that you charge it up to the correct temperature. Also, only charge for as long as the manual recommends.  

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Best 950 CCA Battery For 6.7 Cummins

Odyssey 65-PC1750T 950 CCA

Odyssey 65-PC1750T 950 CCA

Living somewhere that gets cold in winter means you need a battery in your truck that can start it without any problems. Well, this is why you should consider getting Odyssey 65-PC1750T batteries for 2500 or 3500 Ram.

Of the batteries we discuss in this article, this one comes with a 950 CCA rating. It is among the highest of all CCA ratings offered. 

This particular model measures 11.83 x 7.20 x 7.43 inches and weighs in at 60 lbs. So it is one of the heaviest batteries for use with 6.7 Cummins engines. 

The only issue with this battery is the low RC rating it has. This particular battery for such a large one comes with a 130 RC rating. 

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Best Performing Group 65 Battery with Highest CCA Rate

XS Power D6500 XS Series 12V 3,900 Amp

XS Power D6500 960 CCA For Cold Winter

If you are someone who wants to get replacement batteries for your Ram 2500 or 3500 and aren’t worried about spending money? Then you should look at getting a couple of XS Power D6500 XS series ones.

You get what you pay for with this battery as it has proven to outperform others. 

This battery measures 11.8 x 6.8 x 7.2 inches and weighs only 54 lbs. It comes with a 960 CCA rating along with a 150 RC rating.  As a result of its size, this battery is a lot bulkier than others, so you may need to change the box in which it gets placed.

But it does come with the added benefits that these batteries can be recharged quickly, and operate on low resistance. Plus, the manufacturer provides all these batteries with a 60-day money-back guarantee.

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2 Best 94R/H7 Batteries For 6.7 Cummins

 AC Delco Gold 94RAGM
AC Delco Gold 94RAGM
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Delphi BU9094R MaxStart
Delphi BU9094R MaxStart
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Customer Rating
4.4
4.4
Product Dimensions12.4 x 6.9 x 7.5 inches12.5 x 7.5 x 7 inches
Terminal positionPositive rightPositive right
CCA850800
RC140140
Price ($)$160 - $170$230 - $240
Score98.5

Best 850 CCA Rating 94R/H7 Battery

AC Delco Gold 94R AGM Battery

AC Delco Gold Group 94R AGM Battery

Want batteries for your 2500 or 3500 Ram with a high CCA rating? Then look no further than the AC Delco Gold 94RAGM battery. This comes with an 850 CCA rating. So suitable to help get your truck started when it does get really cold.

It is quite a bit bigger than some other batteries you can fit in your Ram 2500 or 3500. This one measures 12.4 x 6.9 x 7.5 inches and only weighs 51.6 lbs, which is a little heavier than some other batteries you can fit in your Ram 2500 or 3500. 

One of the main reasons to buy such a battery is the price, as this one is available for around $164. It also comes with better battery life in comparison to some others. 

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Best Battery For High Vibration Environment

Delphi BU9094R Max Start 140 RC

Delphi BU9094R Max Start 140 RC

Like to take your truck off-road regularly? Well, you need to install batteries in yours that can cope with the amount of vibration passing through your vehicle as it travels over rough terrain.

One of the best Group 94R/H7 batteries to fit in your Ram is the Delphi BU9094R Max Start.

It is a battery that comes with 20 times more vibration resistance than similar priced and sized batteries. The way this battery has been designed ensures that vital components within it are well protected. So ensuring that this battery will work as it should.

This battery measures 12.5 x 7.5 x 7 inches and weighs only 52 lbs. It comes with an 800 CCA rating and a 140 RC rating. 

There are a couple of issues you need to be aware of when it comes to this battery. If you don’t look after it properly, it can die prematurely. Plus, it isn’t compatible with use in all models of vehicles.

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Conclusion

As you can see above, choosing suitable replacement batteries on a 6.7 Cummins engine is crucial. With so many different types available, we hope the above will help you choose the right one that meets your requirements.

But one important thing to remember is that you should choose a battery that will fit easily into the battery box already installed. If not, you will need to either adapt or replace the one already in there.

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