The 2020 Jeep Gladiator uses a 12-volt automotive battery sized Group 86R; if your Gladiator has Auto Start-Stop, you should use an AGM battery; otherwise a standard flooded-type battery in Group 86R is typical.
The Gladiator shares powertrain and electrical architecture with the Wrangler JL, so the same group-size approach applies. Exact specifications can vary by trim, optional equipment, and local climate, so always verify the label on the current battery or the owner's manual before buying a replacement.
Battery group size and type
Before selecting a replacement, it’s important to know the common size and the difference between AGM and flooded batteries for this vehicle:
AGM vs Flooded considerations
Automotive Start-Stop systems usually require an AGM (absorbed glass mat) battery due to higher cycling demands and better deep-discharge tolerance. If your Gladiator is equipped with Start-Stop, you should use a Group 86R AGM 12-volt battery with roughly 800 CCA and adequate RC. If Start-Stop is not present, a standard flooded Group 86R battery may suffice, typically with 700–750 CCA and similar RC.
Additionally, ensure the battery physically fits the tray and terminal layout of your Gladiator. The 86R group is a common size used by many Jeep models; however, some trims or aftermarket replacements may use slightly different dimensions, so verify fitment.
- Group size: 86R is the typical fit for a 2020 Gladiator; some configurations may fit a Group 86 or a closely sized variant.
- Voltage: 12 volts
- Technology: AGM is recommended if Auto Start-Stop is present; flooded lead-acid is common when Start-Stop is not used
- CCA and RC vary by brand; common figures are roughly 700–800 CCA and 90–120 minutes RC
Always verify the exact fit and ratings on the battery label or in the owner's manual before purchasing.
How to confirm the exact battery for your Gladiator
To ensure you buy the right replacement, follow these steps:
- Check your owner's manual or the inside of the glove box for the recommended battery group size and type.
- Read the label on your current battery for group size (e.g., 86R) and CCA/RC ratings.
- When shopping, search for Group 86R 12V AGM if your Gladiator has Start-Stop; otherwise Group 86R 12V flooded is commonly acceptable.
- Use cross-reference resources from major brands (ACDelco, DieHard, Bosch, Interstate) to find compatible options.
- Ask your dealer or service department for Mopar-recommended batteries for your exact trim and equipment.
Make sure the replacement is compatible with your battery terminals and tray, and consider professional installation if needed to preserve warranty coverage.
Summary
For a 2020 Jeep Gladiator, the standard battery is a 12-volt unit sized Group 86R. If your truck is equipped with Auto Start-Stop, choose an AGM battery; if not, a conventional flooded 86R battery is typically acceptable. Always confirm the exact group size, CCA, and RC from the owner's manual or the existing battery label, and select a trusted brand or OEM-equivalent to ensure reliability.