2022-2026 Audi e-tron GT Battery Charging Requirements TSB

Audi has released Technical Service Bulletin (TSB) 2069572/2, which details essential battery recovery and charging requirements for 2022-2026 Audi e-tron GT and RS e-tron GT models. This bulletin is crucial for maintaining the health of the vehicle's 12V LiFePo starter/auxiliary battery, especially when the car is undergoing service or is on display in a showroom. Proper Audi e-tron GT battery charging procedures are vital to prevent battery damage and ensure correct vehicle operation.

This TSB, dated October 30, 2023, supersedes an earlier bulletin, Group 00 number 23-64, from March 3, 2023, reflecting updated information and an expanded model year coverage.

Symptoms of Incorrect Charging

Failing to adhere to the specified Audi e-tron GT battery charging requirements can lead to several issues. Owners might experience:

• Starter / auxiliary battery failure: The 13.2V LiFePo starter/auxiliary battery, with a 60Ah capacity, can become irreversibly damaged.
• Starter / auxiliary battery discharge: The battery may drain completely, especially if the ignition is left on for extended periods or if electronic malfunctions occur.
• Inaccurate State of Charge (SOC) readings: The battery manager may report incorrect state of charge, leading to misdiagnosis or further issues.

Important Warnings for Owners

Audi has issued critical warnings regarding the Audi e-tron GT battery charging process:

• "Warranty claims related to a damaged or drained starter / auxiliary battery -A- that resulted from not using a battery charger, or using an inappropriately sized battery charger that doesn't meet the minimum requirements listed above, may be denied."
• NOTICE: "If the contactors of the 12V battery are open due to low SoC, it may be necessary to 'jump start' the battery charger by touching the charger cable clamps from a 12V source (jump start pack / other 12V battery) for a couple seconds until the charger starts charging."

This TSB is informational and does not fall under Audi's warranty coverage for repairs related to non-compliance.

Technical Background

The Audi e-tron GT is equipped with a LiFePo starter/auxiliary battery. Due to the vehicle's architecture and its advanced 12V battery technology, specific charging and maintenance requirements are necessary. These requirements ensure the battery remains healthy during service work or when the vehicle is displayed. Running the vehicle with only the ignition on, such as in a showroom, or experiencing certain electronic malfunctions, can drain the starter/auxiliary battery. Without a sufficiently sized charger, this can lead to irreversible damage.

Required Charging Specifications

For proper Audi e-tron GT battery charging, any 12V battery charger used must meet the following minimum requirements:

• Continuous output current: At least 80 Amperes (ideally 90 Amperes or more).
• Target charging voltage: 14.8 Volts.
• Absolute maximum voltage: 15.5 Volts. Any voltage spikes exceeding this limit could damage the battery.

Recommended Chargers

Audi suggests specific chargers that meet these requirements:

• Associated ESS6100: Ensure this charger is used in Diag+ mode with a charging voltage set to 14.8V.
• Deutronics VAS5908: This charger should also be set to a charging voltage of 14.8V. Depending on the situation, releasing pin 6161 or activating Diag+ mode by pressing and holding the select button might be necessary if the charger hasn't been connected or started.

Owner Action

If you own a 2022-2026 Audi e-tron GT or RS e-tron GT, it's important to be aware of these specific Audi e-tron GT battery charging requirements. When your vehicle is serviced or if you are considering using an external charger, ensure that the facility or equipment used complies with the specifications outlined in TSB 2069572/2. Failure to do so could result in battery damage, which may not be covered under warranty.

Source: NHTSA ID: 10244529