2024 Jeep Gladiator Battery Size & Group: The Ultimate Replacement Guide

As an ASE-certified master technician, I regularly see late-model Jeeps roll into the bay with electrical gremlins that boil down to one simple thing: a failing battery system. The 2024 Jeep Gladiator is a rugged, highly capable machine, but its modern electrical demands—specifically the Engine Stop/Start (ESS) system—mean you can’t just drop any cheap battery under the hood.

If you're dealing with a slow crank, a dashboard warning, or a disabled auto stop/start system, you're likely in need of a battery replacement. Here is the comprehensive battery spec reference for the 2024 Jeep Gladiator.

Quick answer: 2024 Jeep Gladiator Battery Specs

The 2024 Jeep Gladiator (including both the 3.6L Pentastar V6 and the remaining 3.0L EcoDiesel models) utilizes a dual-battery system to manage the high demands of the Engine Stop/Start (ESS) system.

Main Battery:

• BCI Group Size: Group 94R (also known as H7). Note: Some base models without towing packages may use a Group 48 (H6), but H7 is the primary standard.
• Cold Cranking Amps (CCA): 700 to 850 CCA (800 CCA is standard for factory replacements).
• Reserve Capacity (RC): 130 to 140 minutes.
• AGM vs Flooded: AGM (Absorbent Glass Mat) is strictly required.
• Terminal Layout: Standard Top Post, Right Positive (Passenger side of the battery).
• Physical Dimensions (H7/94R): Approximately 12.4" L x 6.9" W x 7.5" H.

Auxiliary Battery (ESS System):

• BCI Group Size: AUX14 (specifically designed for Jeep/Chrysler ESS systems).
• Cold Cranking Amps (CCA): 200 CCA.
• AGM vs Flooded: AGM required.

Replacement battery options

When replacing the main H7/94R battery in your Gladiator, you want deep-cycle capabilities to handle winch pulls, off-road lights, and the ESS system. Here are some of the most reliable options on the market:

• DieHard Platinum AGM: Group Size 94R (Part No. 94R-AGM) – An excellent, readily available choice with a solid 3-year warranty and excellent vibration resistance.
• Interstate MTZ AGM: Group Size 94R (Part No. MTZ-94R) – Premium pure-lead AGM battery offering massive cranking power and fast recharge times.
• Optima YellowTop: Group Size DH7 (Part No. DH7) – Dual-purpose deep-cycle and starting battery. Highly vibration resistant, making it ideal for heavily modified, off-road Gladiators.
• Odyssey Performance Series: Group Size 94R (Part No. ODP-AGM94R H7L4) – Outstanding durability and extreme temperature tolerance.
• ACDelco Gold AGM: Group Size 94R (Part No. 94RAGM) – A high-quality OEM-equivalent replacement.

Tech Tip: If your main battery fails, there is a very high chance your AUX14 battery is also degraded. It is highly recommended to replace both at the same time.

AGM vs flooded — which does this vehicle need?

Your 2024 Jeep Gladiator strictly requires an AGM (Absorbent Glass Mat) battery. Do not install a traditional flooded lead-acid battery.

The vehicle's Engine Stop/Start (ESS) system creates frequent, heavy electrical draws while the engine is off (running the HVAC, infotainment, and lighting). A traditional flooded battery will quickly degrade under this deep-cycling stress. AGM batteries are specifically designed to handle rapid discharging and recharging, and they are built to withstand the heavy vibrations that a solid-axle off-road vehicle like the Gladiator produces.

Post-installation relearn / reset procedure

The Gladiator is equipped with an Intelligent Battery Sensor (IBS) on the negative terminal that monitors battery health, age, and state of charge. When you install a new battery, the system needs to know it has a fresh power source so it doesn't overcharge it.

1. Scan Tool Method (Preferred): Use a bi-directional OBD2 scan tool to navigate to the Body Control Module (BCM) and select "Battery Replacement Reset" or "IBS Relearn."
2. Self-Learn Method: If you don't have a scan tool, install the new batteries, roll up the windows, turn off all accessories, and lock the doors. Leave the vehicle completely undisturbed for at least 4 to 8 hours (overnight is best). The IBS will read the new resting voltage and reset its internal algorithms. Until it relearns, the auto stop/start system may display an "ESS Not Ready" message.

Signs of a failing battery

• "Auto Stop/Start Unavailable" warning: This is usually the very first sign. The computer disables ESS to conserve power when battery voltage drops.
• Slow or labored engine cranking: Especially noticeable on cold mornings.
• Random dashboard warning lights: Low voltage can cause the ABS, traction control, or check engine lights to trigger sporadically.
• Relay clicking: A rapid clicking sound when you push the start button means the battery doesn't have enough amps to engage the starter.

Common battery issues for this generation

The Achilles' heel of the Jeep Gladiator (and its Wrangler JL sibling) is the dual-battery ESS setup. The AUX14 battery is tucked underneath the main power distribution center (fuse box).

A very common issue is that the small auxiliary battery reaches the end of its life before the main battery does. Because the two batteries are wired in parallel when the truck is parked, a dead aux battery will physically drain the main H7 battery, leaving you stranded. If you find your Gladiator completely dead after sitting for just a weekend, the aux battery is likely the culprit.

If you are dealing with persistent electrical issues or want a professional to handle the dual-battery swap (getting to the aux battery requires removing the fender liner or unbolting the fuse box), don't risk damaging your truck's sensitive modules.

Find a trusted shop on Repairius.