2021 Ford F-150 Battery Size & Specs

Quick answer: 2021 Ford F-150 Battery

• BCI Group Size: H6 (also called Group 48) or H7 (also called Group 94R). The 3.5L PowerBoost hybrid uses an H7. Many non-hybrids use the slightly smaller H6.
• Cold Cranking Amps (CCA): 760 CCA (H6) or 800 CCA (H7) for the OEM Motorcraft battery. Aftermarket batteries may vary slightly.
• Reserve Capacity (RC): 130 minutes (H6) or 140 minutes (H7).
• AGM vs. Flooded: All 2021 F-150s with auto start-stop technology require an Absorbent Glass Mat (AGM) battery. Given that the vast majority of F-150s have this feature, an AGM is strongly recommended.
• Terminal Layout: Standard top-post design. The positive terminal is on the right (SAE Post).
• Physical Dimensions (L x W x H):
  • H6/Group 48: 10.9" x 6.9" x 7.5"
  • H7/Group 94R: 12.4" x 6.9" x 7.5"
• Dual-Battery Setup: The diesel engine was discontinued for the 2021 model year; no F-150 from this year has a dual-battery setup from the factory.

Replacement Battery Options

Choosing a quality replacement battery is crucial for the longevity and performance of your F-150's complex electrical system. Here are some of the most popular and trusted options available:

• Motorcraft (OEM): BAGM-48H6-760 (H6), BAGM-94RH7-800 (H7)
• Interstate: MTX-48/H6, MTX-94R/H7
• DieHard: Platinum AGM H6, Platinum AGM H7/94R
• Optima: YellowTop DH6, YellowTop DH7
• Odyssey: ODP-AGM48 H6, ODP-AGM94R H7
• ACDelco: 48AGM, 94RAGM

AGM vs. Flooded — Which Does This Vehicle Need?

The 2021 Ford F-150 comes equipped with a Battery Management System (BMS) and, in most cases, auto start-stop technology. These systems place a high demand on the battery. An Absorbent Glass Mat (AGM) battery is designed to handle the frequent, deep discharge cycles that start-stop systems create. A traditional flooded lead-acid battery would have a significantly shorter lifespan in this application.

AGM batteries offer several advantages:

• Faster Recharging: They can accept a charge faster than flooded batteries.
• Durability: They are more resistant to vibration.
• Spill-Proof: The electrolyte is absorbed in glass mats, making them safer and less likely to leak.

While an H6 or H7 flooded battery might fit physically, installing one in an F-150 designed for an AGM will likely lead to premature battery failure and could cause issues with the vehicle's electrical systems.

Post-Installation Relearn / Reset Procedure

After replacing the battery in your 2021 F-150, you must perform a Battery Management System (BMS) reset. The BMS monitors the battery's state of charge and health over time. If you don't reset it, the system will continue to charge the new battery as if it were the old, degraded one, which can shorten the new battery's life.

To reset the BMS:

1. Turn the ignition on (without starting the engine).
2. Pull and release the high beam lever five times.
3. Press and release the brake pedal three times.
4. The battery light on the dashboard should flash three times within 15 seconds to confirm the reset was successful.

If this procedure doesn't work, you may need a diagnostic scan tool with BMS reset capabilities.

Signs of a Failing Battery

• Slow Engine Crank: The engine turns over sluggishly, especially in cold weather.
• Dimming Lights: Headlights and interior lights dim when the engine is off or at idle.
• Warning Lights: A battery or check engine light may illuminate on the dash.
• Auto Start-Stop Malfunction: The start-stop system may stop working to conserve battery power.
• Swollen Battery Case: A sign of internal damage from heat or overcharging.

Common Battery Issues for This Generation

The 14th-generation F-150 (2021-present) has sophisticated electrical demands. The most common issue is premature battery failure due to an incorrect battery type being installed (flooded instead of AGM) or failure to perform the BMS reset after replacement. Some owners have also reported parasitic drains from onboard modules that can deplete the battery if the truck sits for an extended period.

Find a trusted shop on Repairius.