What size battery is in the Dodge Ram Cummins?
In most Ram pickups equipped with a Cummins diesel, you’ll find a dual 12-volt battery setup rather than a single battery. The exact size varies by model year and trim, but two 12-volt batteries wired in parallel are typically used to provide the necessary cranking power for a diesel engine.
Battery configuration and why it matters
The Cummins-powered Ram is built to deliver high starting torque and reliable electrical performance under heavy use. Because diesel engines require more cranking power than gasoline engines, most Ram Cummins rigs use two batteries. Exact group sizes and CCA ratings are not identical across all years and packages, so the precise spec can vary.
Typical configurations you may encounter
Before listing, note that sizes can vary by year and option package. The following configurations are commonly observed in Ram Cummins trucks.
- Two 12-volt lead-acid batteries, wired in parallel to preserve 12V while increasing total capacity.
- Possible group sizes per battery include common automotive sizes such as 24F or 31; cold-cranking amps (CCA) per battery generally fall in a broad range (roughly 700–1000 CCA, depending on brand and specific model).
- In many configurations, both batteries are similar or identical in rating to ensure balanced performance and easier replacement.
Always check the battery label or the owner's manual for the exact group size and CCA for your specific vehicle.
How to identify the exact battery in your Ram Cummins
To be precise about your vehicle, locate the battery and read the label on each unit. Look for the group size code, cold-cranking amps, and reserve capacity. If you’re unsure, consult your owner's manual or speak with a Dodge/Ram dealer or trusted mechanic to confirm the exact specifications for your year and trim.
Why this matters for maintenance and replacement
When replacing, many owners replace both batteries at the same time to maintain balanced performance and avoid mismatched charging. Use batteries with the same specs and ensure your alternator and electrical system are capable of recharging the dual-battery setup efficiently.
Additional notes
Some configurations may include a battery isolator or starter/dual-battery setup with specific wiring or maintenance requirements. Aftermarket changes can also alter the standard arrangement, so verify your current setup if you’re planning replacements or upgrades.
Summary: The Dodge Ram Cummins typically uses two 12-volt batteries wired in parallel to meet the starting and electrical needs of a diesel engine. Exact group size (such as 24F or 31) and CCA ratings vary by year and option package, so check the battery label or owner’s manual for your specific truck. When in doubt, replace both batteries in pairs and ensure your charging system is up to the task.
What size battery is in the 2019 Ram 2500 6.7 Cummins?
M-94R/H7.
What size battery does a Dodge Ram 2500 diesel take?
A 2021 Dodge Ram 2500 diesel uses a group size 94R or H7 battery. Many newer models may use an H7 or H8, so it's essential to check the specific year and model for the correct fitment, as some aftermarket accessories can affect battery choice.
- Group Size: The most common battery size is group 94R, which is also designated as H7.
- Verification: It is recommended to verify the correct battery size for your specific truck year and model, especially if you have aftermarket accessories, as different configurations may require a specific battery, such as an H7 or H8, notes OPTIMA Batteries.
- Technology: Battery options include AGM (Absorbed Glass Mat), EFB (Enhanced Flooded Battery), and traditional lead-acid, so you can choose a technology that best fits your needs, suggests AutoZone.com.
What size battery is in the 2018 Ram 3500 6.7 Cummins?
The 2018 Ram 3500 with the 6.7 Cummins diesel engine uses two batteries of BCI Group Size 94R (H7). These should be identical in age, type, and size to ensure proper performance and lifespan.
- BCI Group Size: 94R
- Alternative/Equivalent Size: H7
- Important Note: When a vehicle requires two batteries, they must be a matched set. Using two different batteries can cause performance issues and reduce their lifespan.
What size battery is in a 2001 Dodge Ram 2500 5.9 Cummins?
The 2001 Dodge Ram 2500 5.9 Cummins typically uses a BCI Group 27 battery, though some models may also be compatible with Group 34/78 batteries. For optimal performance, look for a battery with high Cold Cranking Amps (CCA) to handle the diesel engine's demands. Many sources also recommend a deep-cycle, AGM (Absorbent Glass Mat) battery for reliability.
Common battery sizes
- BCI Group 27: This is a common and recommended size, with many options available that meet or exceed the original specifications.
- BCI Group 34/78: This dual-terminal group size is also listed as compatible with many 2001 models.
Key specifications to look for
- Cold Cranking Amps (CCA): Choose a battery with a high CCA rating to ensure reliable starts, especially in cold weather. Look for a rating of at least 700-800 CCA or higher.
- Reserve Capacity (RC): A higher reserve capacity means the battery can power the vehicle's accessories for a longer period if the alternator fails.
- Battery Type: AGM (Absorbent Glass Mat) batteries are often recommended for their durability and performance, though flooded lead-acid batteries are also available.
Important considerations
- Dual Batteries: Some heavy-duty diesel trucks are equipped with two batteries. If this is the case, it's best to replace both at the same time.
- Physical Dimensions: When choosing a battery, confirm that its physical dimensions (length, width, and height) will fit correctly in the battery tray under the hood and that the terminals are in the correct positions.
- Check Your Specific Model: It's always best to verify the correct battery size and specifications for your specific truck by checking your owner's manual or the existing battery before purchasing a replacement.
