2016 Tesla Model X Battery Replacement Guide

Quick answer

• BCI Group Size: 12V Auxiliary Battery: Group 33 (often identified as a small motorcycle/powersport battery style, not a traditional automotive BCI group)
• CCA Rating: Not applicable for the 12V auxiliary battery, as it's a support battery, not a starting battery. The main high-voltage battery handles propulsion.
• Reserve Capacity: Typically around 30-40 minutes (depends on specific battery).
• AGM vs. Flooded: AGM (Absorbent Glass Mat) is almost exclusively used for the 12V auxiliary battery in the Model X due to its sealed, maintenance-free nature and better performance in varying temperatures.
• Terminal Layout: Unique; often with spade terminals or small bolt-on terminals rather than traditional automotive posts. Refer to the specific battery for exact layout.
• Physical Dimensions: Varies slightly by manufacturer, but generally compact to fit in its dedicated space. Roughly 7.5" L x 5" W x 7" H (approximate for typical replacements).
• Dual-Battery Setup: The Tesla Model X does not have a dual-battery setup in the traditional sense. It has a large high-voltage traction battery for propulsion and a separate 12V auxiliary battery for powering the vehicle's low-voltage systems.

Replacement battery options

Finding direct equivalents for the 2016 Tesla Model X's 12V auxiliary battery can be tricky due to its specialized nature. These are often branded for Tesla directly or by specialized manufacturers. Generic equivalents from mainstream brands are less common, but some specialty AGM batteries can fit.

• Tesla Original Part: Consult your local Tesla Service Center for the exact OEM replacement part.
• Optima: Optima does not typically make a direct fit for the Model X 12V auxiliary battery.
• Odyssey: Odyssey does not typically make a direct fit for the Model X 12V auxiliary battery.
• Other Specialty AGM Brands: Some high-quality AGM motorcycle or powersport batteries (e.g., Yuasa, Shorai - though often lithium, not lead-acid) might have similar dimensions, but always verify voltage, capacity, and terminal type.

AGM vs. flooded — which does this vehicle need?

A 2016 Tesla Model X requires an AGM (Absorbent Glass Mat) battery for its 12V auxiliary system. The vehicle's sophisticated electrical architecture demands the stable voltage, sealed design, and vibration resistance that AGM technology provides. Flooded lead-acid batteries are not suitable due to their venting requirements, potential for leaks, and generally lower performance in the demanding environment of modern EVs.

The 12V auxiliary battery in a Tesla powers all the low-voltage systems, including the infotainment, lights, door locks, and serves as the