In short, RAM 2500 trucks use a 12-volt starting battery. Gasoline-powered models rely on a single 12-volt battery, while diesel-equipped Ram 2500s with the Cummins engine typically use a dual 12-volt battery setup to provide extra cranking power and support heavy electrical loads.
Battery configuration by engine
The following overview explains how the battery setup typically differs by engine option in current RAM 2500 trucks.
- Gasoline-powered RAM 2500s (e.g., 5.7L Hemi, 6.4L Hemi): one 12-volt starting battery.
- Cummins Turbo Diesel RAM 2500s (6.7L): two 12-volt batteries wired in parallel to increase cold-cranking amps and reliability.
Bottom line: If you own or are considering a RAM 2500 with a diesel engine, expect a dual-battery system; gasoline models use a single 12-volt battery. Confirm exact specs and group size for your model year and trim in the owner's manual or on the battery label.
Diesel vs gasoline specifics
Diesel and gas variants differ beyond battery count. The diesel setup is designed to crank a high-compression engine and support added electrical loads from glow plugs and related systems. Gas engines generally require less starting power and thus use a single battery.
Maintenance and replacement tips
When replacing RAM 2500 batteries, use the correct battery group size and terminal configuration, and ensure proper secure mounting. For diesel models with two batteries, replace both at the same time to maintain even charging and performance. Regularly inspect terminals for corrosion and keep the battery case clean.
Summary
The RAM 2500 uses a 12-volt starting battery; diesel models typically use two 12-volt batteries in parallel, while gasoline models use a single 12-volt battery. Always verify exact specifications for your year and trim, and follow manufacturer guidance for replacement and maintenance.
What type of battery is in a Ram 2500?
DieHard Platinum AGM – Battery : H7 Group Size, 850 CCA, 1000 CA, 140 Minute Reserve Capacity (Part No. H7-AGM)
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What batteries go in a 2020 Ram 2500 diesel?
Super Start Platinum AGM Top Post Battery Group Size 94R H7 800 CCA 140 Minute RC - 94RPLT.
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What battery does a Dodge Ram use?
Some of our most popular batteries for Ram vehicles are the Duracell Ultra Platinum AGM Group 94R Battery, the Duracell Ultra Gold Flooded Group 48 Battery and the Duracell Ultra Gold Flooded Group 94R Battery.
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What size battery is in the Dodge Ram Cummins?
Most newer RAM trucks will use either a DH7 or H8 battery.
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