2018 Ford F-250 Super Duty Battery Size & Group

Quick answer:

• BCI Group Size (6.7L Power Stroke Diesel): Group 65 (QTY 2)
• BCI Group Size (6.2L V8 Gas): Group 65
• CCA Rating (6.7L Power Stroke Diesel): 750-850 CCA per battery (check OEM or replacement for exact spec)
• CCA Rating (6.2L V8 Gas): 750-850 CCA
• Reserve Capacity: 130-160 minutes (typically higher for diesel batteries)
• AGM vs. Flooded Requirement: Most F-250s come with flooded lead-acid batteries from the factory. While AGM is an upgrade, ensure proper charging system compatibility if switching. Newer Ford trucks with start-stop technology often require AGM, but the 2018 F-250 typically does not have this feature on all trims.
• Terminal Layout: Top post, typically B (positive on left, negative on right when terminals are facing you).
• Physical Dimensions: Approximately 12" L x 7.5" W x 7.5" H (varies slightly by manufacturer and specific Group 65 design).
• Dual-Battery Setup: Yes, the 6.7L Power Stroke Diesel models utilize a dual-battery setup (two Group 65 batteries wired in parallel) for increased cranking power and accessory support.

Replacement battery options:

For your 2018 Ford F-250 Super Duty, here are some popular Group 65 replacement battery options. Always double-check fitment and specifications with the retailer before purchase. Part numbers can vary and are often manufacturer-specific, so it's always best to provide your vehicle year, make, and model when shopping.

• Interstate: MTZ-65 (AGM), MTP-65 (Flooded)
• Optima: YellowTop DH6 (AGM, though Optima's group sizes sometimes differ slightly, verify fitment)
• DieHard: Platinum AGM Group 65, Gold Group 65 (Flooded)
• Odyssey: ODP-AGM65 (AGM)
• ACDelco: 65AGMHR (AGM), 65-7YR (Flooded)

AGM vs. flooded — which does this vehicle need?

For the 2018 Ford F-250 Super Duty, the factory typically installed conventional flooded lead-acid batteries. These are generally reliable and cost-effective. However, upgrading to an Absorbed Glass Mat (AGM) battery offers several advantages:

• Durability: AGM batteries are more resistant to vibration and impacts, which is beneficial for heavy-duty trucks.
• Maintenance-Free: They are sealed and do not require water topping.
• Deeper Discharge Cycles: AGM batteries can withstand deeper discharge cycles without significant damage, making them a good choice if you frequently use accessories with the engine off or have aftermarket electronics.
• Slower Self-Discharge: They tend to hold a charge longer when the vehicle is not in use.

While an AGM battery is generally an upgrade, it's not strictly required unless specified by Ford (e.g., if a particular F-250 trim or option package came with start-stop technology, which is rare for the 2018 F-250). If you opt for an AGM, ensure your vehicle's charging system is functioning correctly to fully leverage its benefits. For diesel models, if you replace one battery with an AGM, it's highly recommended to replace the other with an AGM of the same brand and type to ensure balanced charging and discharge.

Post-installation relearn / reset procedure

After disconnecting and reconnecting the battery in your 2018 Ford F-250 Super Duty, you may need to perform a few simple procedures to restore full functionality to some vehicle systems. While not as complex as some modern vehicles, here's what to expect:

1. Idle Relearn: The engine's computer (PCM) may need to re-learn its idle strategy. After starting the engine, allow it to idle for 5-10 minutes without touching the accelerator. You might notice a slightly rough idle initially.
2. Window Express Up/Down: The one-touch up/down feature for the power windows may need to be reset. To do this, roll the window down fully, then hold the switch in the