The 2018 Ram ProMaster 3500 uses a standard 12-volt automotive battery; the exact battery group size depends on the engine and equipment, but all configurations rely on a 12V lead-acid unit.
In detail, Ram offered the ProMaster 3500 with two main engine options for that year—the 3.6-liter Pentastar V6 gasoline and the 3.0-liter EcoDiesel—and both rely on a 12-volt battery. The specific group size (the battery’s physical dimensions and terminal layout) can vary by trim and market. To confirm the precise size for your vehicle, check the battery label or consult the owner's manual or RAM/Mopar documentation for your VIN.
Engines and their impact on the battery
Before listing the engine options and their implications for the electrical system, note these core points about the battery in the 2018 ProMaster 3500:
- Gasoline engine option: 3.6L Pentastar V6. Uses a standard 12V starting battery; the exact group size can vary by trim and regional specs.
- Diesel engine option: 3.0L EcoDiesel. Also uses a 12V battery; group size may differ from the gasoline version depending on equipment and market.
- All configurations require a robust 12V battery capable of starting the engine and powering accessories during cargo-van operation.
In short, the battery type (12V lead-acid) is consistent, but the exact group size isn’t fixed across all 2018 ProMaster 3500 models. Verification on the vehicle or documentation is recommended for an exact match.
How to identify the exact size you need
To determine the precise group size for your vehicle, use the following steps:
- Inspect the battery label: the group size is typically printed on the end or top of the battery.
- Consult the owner's manual or RAM/Mopar parts catalog for your VIN’s original equipment battery specification.
- Compare the physical dimensions and terminal layout with common ProMaster group sizes used in North America.
With the exact group size, source a replacement that matches or exceeds the original rating, paying attention to cold-cranking amps (CCA) and capacity to ensure reliable starts and electrical performance in cargo-van conditions.
Summary
The 2018 Ram ProMaster 3500 runs on a 12-volt automotive battery, with the precise group size varying by engine and configuration. To ensure an accurate replacement, verify the battery’s group size on the label or in the owner's manual, and choose a battery that matches or exceeds the original CCA and capacity for dependable starting and operation.
What kind of battery does a Dodge Ram 3500 take?
Most Ram 3500 models use Group 65 or 94R batteries, while diesel trims may use dual Group 94R/78 batteries.
What are common ProMaster 3500 problems?
What are the most common Ram ProMaster problems?
- Electrical system malfunctions.
- Transmission hesitation.
- Interior build quality problems.
- Rearview camera glitches.
Can I use a group 24 battery instead of 35?
Group-24, Group-27
The Group 24 and 27 Batteries are mostly found in older American Cars, and some Hondas, GMs and will be often used in boats. They are basically the same size except for length. Our Group-35 can be used in place of a Group-24; it is only 1-inch shorter left to right dimensions.
Where is the battery on a ProMaster 3500?
It is below. The driver's seat feet and there's this panel that comes off and the battery is a type 95. So it is a big long heavyduty battery uh my recommendation is go to one of the big box stores.