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Rivian R1T 12V Battery Location: The Complete Problem-Solver's Guide

Whether you're jump-starting a dead R1T, performing routine maintenance, or diagnosing electrical gremlins, knowing exactly where the 12V battery lives—and how to access it—saves time, money, and frustration. This guide covers everything Rivian R1T owners need to know about the auxiliary battery system.

Key Takeaways

• The Rivian R1T 12V auxiliary battery is located in the front trunk (frunk) on the driver's side, behind a removable trim panel near the front suspension tower.
• Unlike conventional gasoline vehicles, the R1T relies on a small 12V battery to power electronics, door locks, and startup systems—not the massive high-voltage traction pack.
• You can access the 12V battery terminals for jump-starting without opening the frunk by using the under-hood (frunk) jump-positive terminal and a dedicated ground point.
• The 12V battery is a Mercury AGM (Absorbent Glass Mat) unit, approximately 12–18 Ah, and is not routinely serviceable as a standalone replacement under warranty.
• Symptoms of a failing 12V battery include failure to power on, error messages about DC-DC converter issues, and inability to unlock or open the frunk.

Where Is the 12V Battery Located in a Rivian R1T?

Primary Location: Front Trunk (Frunk), Driver's Side

The Rivian R1T's 12V auxiliary battery is housed in the front trunk compartment (frunk), mounted on the driver's side of the vehicle, adjacent to the front suspension strut tower and near the frame rail.

To access it directly:

1. Open the frunk by pressing the interior release or using the key fob.
2. Remove the side trim panel on the driver's-side wall of the frunk. This is typically held by plastic push clips.
3. Behind the panel, you will find the 12V AGM battery secured in a plastic tray with a hold-down bracket.
4. The positive terminal is covered by a red plastic cap; the negative terminal connects via a ring bolt to the chassis ground.

Jump-Start Access Point (No Frunk Opening Required)

Rivian engineered a convenient external jump-start access point so you never need to dig through frunk trim to revive a dead 12V system:

• Positive jump terminal: Located under the front fascia, near the driver-side headlight area. Remove the small circular cover to expose the +12V service point.
• Ground point: A dedicated grounding bolt is located on the front frame rail, clearly marked with a grounding symbol.

This setup mirrors the jump-point convention found in many modern vehicles and eliminates the need to access the battery itself in most emergency scenarios.

12V Battery vs. High-Voltage Traction Battery: Understanding the Difference

Comparison: Rivian R1T 12V Auxiliary Battery vs. High-Voltage Traction Pack

Feature	12V Auxiliary Battery	High-Voltage Traction Battery
Location	Front trunk (driver side)	Underfloor, spanning the wheelbase
Voltage	12 volts DC	~400V nominal (up to ~500V+ when charged)
Chemistry	AGM Lead-Acid (Mercury Battery)	Lithium-ion (NMC cells)
Capacity	Approx. 12–18 Ah	100–149 kWh (depending on pack size)
Purpose	Power electronics, door locks, infotainment, startup relay	Propel the vehicle (traction motors)
Replacements	Standard automotive AGM; replaceable	Factory-sealed; not user-replaceable
Charging	Charged by DC-DC converter from HV pack	Charged via charging port (AC/DC fast charge)
Typical Lifespan	3–5 years	8–15+ years (warranty-backed)

How to Replace the Rivian R1T 12V Battery

Step-by-Step Replacement Checklist

• Prepare your workspace: Park on a flat surface, engage the parking brake, and ensure the vehicle is powered down completely.
• Open the frunk and remove the driver-side trim panel using a trim removal tool to avoid damaging push clips.
• Disconnect the negative (−) terminal first, then the positive (+) terminal. This order prevents accidental short circuits.
• Remove the hold-down bracket securing the battery tray.
• Lift out the old AGM battery carefully—these are heavy (roughly 25–35 lbs) and must stay upright to avoid electrolyte leakage.
• Clean the tray and terminal contacts with a wire brush and terminal cleaner.
• Install the new battery (ensure correct polarity and group size compatibility—typically a 12V AGM compatible with EV auxiliary applications).
• Reconnect the positive (+) terminal first, then the negative (−) terminal, and torque to specification.
• Secure the hold-down bracket and reinstall the trim panel.
• Verify operation: Power on the vehicle and confirm no fault codes appear on the touchscreen.

Recommended Battery Specifications

When replacing the R1T 12V battery, look for these specifications to ensure proper fit and function:

Specification	Recommended Value
Type	AGM (Absorbent Glass Mat)
Voltage	12V DC
Capacity	12–18 Ah minimum
Terminal Layout	Top-post, L+ / R− (verify orientation)
Cold Cranking Amps (CCA)	200+ CCA recommended
Dimensions (approx.)	10.25" × 6.88" × 8.5" (Group H/ETX