The 2018 Ram 1500 uses a standard 12-volt automotive battery, with the most common OEM fitment being a Group 94R size battery rated around 800 cold-cranking amps (CCA). When shopping for a replacement, match the group size and CCA rating to the original, and consider an AGM battery only if your truck has start-stop or heavy electrical loads that benefit from higher resistance to vibration and better performance in extreme temperatures.
The exact battery for a 2018 Ram 1500 can vary by engine and equipment level. Whether your truck has the 3.6L Pentastar, the 5.7L Hemi, or the 3.0L EcoDiesel, the battery needs are guided by the OEM specification, battery tray space, terminal layout, and whether an optional high-demand system is installed. Always verify the specification on the battery label or in the owner's manual to ensure a correct fit.
Understanding the Ram 1500’s battery needs
This model year generally relies on a 12-volt flood-lead or AGM battery to power starting and electrical systems. The most common replacement path is a Group 94R battery, which fits the Ram’s tray and terminal arrangement. For trucks equipped with additional electrical demand or a start-stop system (where applicable in later year updates), an AGM variant may be recommended for improved durability and performance. The key is to confirm group size, CCA rating, and terminal layout before purchasing.
Below are some common options and considerations to help you navigate replacement choices.
Note: The following list explains typical options you’ll encounter, not a definitive catalog of every possible configuration for every Ram 1500 build.
- Group size and type: Most 2018 Ram 1500 replacements use a Group 94R-sized 12V lead-acid battery (flooded). This size fits the standard Ram battery tray and connector layout.
- Cold-cranking amps (CCA): Look for a rating in the 750–900 CCA range for reliable cold starts, with higher CCA benefiting colder climates or older batteries.
- Battery type: Flooded lead-acid (standard) or absorbed glass mat (AGM) depending on electrical demands or if your vehicle is equipped with a start-stop system.
In practice, most replacement batteries for a stock 2018 Ram 1500 should be Group 94R or an equivalent size that matches the factory fit. If you’re unsure, consult the label on your current battery or the vehicle’s manual, and choose a unit that matches both the physical fit and the electrical specifications.
How to choose the right battery for your 2018 Ram 1500
- Check the vehicle’s owner manual or the original equipment battery label for the exact group size (often 94R for Ram 1500s in this era) and the recommended CCA rating.
- Inspect the current battery for its group size and terminal orientation; differences in positive/negative terminal placement can affect fitment.
- Decide between flooded lead-acid and AGM based on your climate, driving habits, and electrical load. AGM is a good option if your Ram has demanding electronics or start-stop, but it comes at a higher price.
- Ensure the replacement physically fits the battery tray, holds down clamp, and allows proper clearance for hoses and components around the battery.
- Have the battery installed by a qualified technician if you’re uncomfortable with the replacement process, especially if an AGM is used or if there are safety concerns with handling acids.
Bottom line: for a typical 2018 Ram 1500, plan for a 12-volt battery in Group 94R with around 750–900 CCA, choosing flooded or AGM based on your vehicle’s equipment and climate. Always verify the exact spec by checking the label or the owner’s manual to ensure proper fit and performance.
Installation tips and maintenance
Before replacing the battery, make sure the engine is off, remove jewelry or metal tools that could cause short circuits, and disconnect the negative terminal first. Clean any corrosion from terminals and ensure the hold-down clamp is secure after installation. If you experience persistent starting issues after replacement, have the charging system (alternator and wiring) tested to rule out other problems.
Summary
The 2018 Ram 1500 typically uses a 12-volt automotive battery, with Group 94R as the common replacement size and roughly 750–900 CCA depending on climate and equipment. Confirm the exact spec on your current battery or in the owner’s manual, and choose between flooded lead-acid or AGM based on electrical demands. Following proper fitment and installation practices will help ensure reliable starts and electrical performance for years to come.