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 or 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.
AT A GLANCE: OUR TOP 5 PICKS FOR 6.7 CUMMINS BATTERIES
| Image | Product | Features | Price |
|---|---|---|---|
 | ODYSSEY Group 65 |
| Check Price |
 | ACDelco Group 94R |
| Check Price |
 | XS Power Group 65 |
| Check Price |
 | Delphi Group 94R |
| Check Price |
 | Delphi Group 65 |
| Check Price |
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 Size | Dimensions (in) | Dimensions (mm) | Terminal Position |
| 65 | 12.1×7.5×7.6 | 306x190x192 | Left positive |
| 94R | 12.4×6.9×7.5 | 315x175x190 | Right 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/Model | Group |
| 2016 RAM 2500 & 3500 | 94R |
| 2017 RAM 2500 & 2500 | 94R |
| 2018 RAM 3500 | 65 |
| 2021 Ram 2500 & 3500 | 65 |
| 2014 Ford F-250 | 65 |
| 2018 Ford F-250 | 65 |
| 2017 Ford F-350 | 65 |
| 2018 Ford F-350 | 65 |
Buy Group 65, Group H7/94R batteries here:
Group 65 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 Group 65 1070 CCA
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 $395 or more.
3 Best Group 65 Batteries For 6.7 Cummins
 Odyssey 65-PC1750T |  XS Power D6500 |  Delphi BU9065 MaxStart |
|
|---|---|---|---|
| Customer Rating |  |  |  |
| Product Dimensions | 11.8 x 7.2 x 6.8 in | 11.8x6.80x7.20 in | 10.6 x 10.4 x 8.2 in |
| Terminal position | Positive left | Positive left | Positive left |
| CCA | 950 | 1070 | 770 |
| RC | 145 | 174 | 150 |
| Price ($) | $290 - $300 | $390 - $400 | $260 - $280 |
| Score | 9 | 8.5 | 8.5 |
Best Battery For High Vibration Environment
Best 950 CCA Battery For 6.7 Cummins
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.
Best Performing Group 65 Battery with Highest CCA Rate
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.
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.
2 Best 94R/H7 Batteries For 6.7 Cummins
 AC Delco Gold 94RAGM |  Delphi BU9094R MaxStart |
|
|---|---|---|
| Customer Rating |  | |
| Product Dimensions | 12.4 x 6.9 x 7.5 inches | 12.5 x 7.5 x 7 inches |
| Terminal position | Positive right | Positive right |
| CCA | 850 | 800 |
| RC | 140 | 140 |
| Price ($) | $160 - $170 | $230 - $240 |
| Score | 9 | 8.5 |
Best 850 CCA Rating 94R/H7 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.
Best Battery For High Vibration Environment
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.
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.
