2022 Tesla Model S Battery Size & Group

Quick answer

• BCI Group Size: Auxiliary 12V Battery: Group 51R
• CCA Rating: Not typically rated for primary traction battery. Auxiliary 12V battery: Approximately 450-500 CCA (varies by manufacturer)
• Reserve Capacity: Auxiliary 12V battery: Approximately 70-90 minutes (varies by manufacturer)
• AGM vs Flooded Requirement: Auxiliary 12V battery: AGM Recommended
• Terminal Layout: Auxiliary 12V battery: Top Post, typically R-Positive layout
• Physical Dimensions: Auxiliary 12V battery: Dimensions vary slightly by manufacturer, but generally fit the Group 51R specifications (e.g., L: 9.375", W: 5.0625", H: 8.75")
• Dual-Battery Setup: No (The Tesla Model S uses a large high-voltage traction battery for propulsion and a separate 12V auxiliary battery for ancillary systems.)

Replacement battery options

For the 12V auxiliary battery in your 2022 Tesla Model S, consider these popular replacement options. Always verify the group size and specifications before purchasing.

• Interstate: MT51R (AGM)
• Optima: YellowTop DS46B24R (though a Group 51R is more common for direct fit, some owners adapt this battery)
• DieHard: Platinum AGM Group 51R
• Odyssey: ODP-AGM51R
• ACDelco: 51RAGM

AGM vs flooded — which does this vehicle need?

The 2022 Tesla Model S, like most modern electric vehicles, requires an AGM (Absorbed Glass Mat) battery for its 12V auxiliary system. While traditional flooded lead-acid batteries might physically fit, they are not suitable for the demands of an EV's electrical system.

AGM batteries offer several advantages critical for EVs:

• Deep Cycle Capability: EVs frequently use the 12V battery to power various electronics even when the car is "off" or in standby mode. AGM batteries are designed to handle repeated deep discharges and recharges better than flooded batteries.
• Vibration Resistance: Electric vehicles often have a stiffer ride and less internal combustion engine vibration, but overall vehicle dynamics still benefit from an impact-resistant battery design. AGM batteries, with their tightly packed plates, are more resistant to vibration damage.
• Sealed, Maintenance-Free Design: AGM batteries are sealed, preventing acid leaks and eliminating the need for water top-offs. This is crucial in an EV where battery access might be more restricted and a clean, safe environment is paramount.
• Higher Cranking Amps & Faster Recharging: Although the 12V battery doesn