Audi Key Fob Battery Replacement  Audi A3, S3, RS3, A4, S4, A5, S5, A6, S6, A7, S7, RS7, A8, S8, Q3, Q5, SQ5, Q7, TT, R8

Audi Key Fob Battery Replacement Guide

Last Updated on Wednesday Mar 07, 2018

If your Audi key fob battery dies or is weak, you will not be able to lock/unlock the car. The Start/Stop button will not work. On newer Audis, you will get a warning on your dashboard that displays a key and battery symbol. To fix these problems, change the battery on your Audi key fob.

In this guide, you will find videos and step-by-step instructions on how to change the battery on any Audi key fob remote. Over the years, Audi has come out with a few different key designs. Scroll down until you see the key that matches the one you have. These instructions will help owners of Audi A3, S3, RS3, A4, S4, A5, S5, A6, S6, A7, S7, RS7, A8, S8, Q3, Q5, SQ5, Q7, TT, R8 change the key fob battery. 

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1. Audi Flip Key Fob Battery Replacement 

Watch the video on how to change the battery on Audi three button key fob. This keyfob was used in most 1997 to 2005 Audi vehicles. This Audi remove was used in models such as Audi A4, A6, A8, TT etc. 

Battery Size: CR1620 (ONE)

Replacement Shell: Audi Keyfob Shell

Instructions

  1. Use a flat screwdriver to separate the case into two halves. 
  2. The battery is inside the case that does NOT have the flip metal key. 
  3. Use the screwdriver again to separate the shell. 
  4. Remove the CR1620 button cell battery. Pay attention to the positive side of the battery. 
  5. Press the new battery in the housing. 
  6. Press the shell together until you hear it snap. 
  7. Press the two halves together and you are done changing your Audi key battery.
  8. If the lock/unlock feature does not work after you change the battery, insert the key into the driver's door. Turn the key to lock and unlock position to make the car recognize your key fob. Remove key fob from the door and press unlock.
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2. Audi Smart Keyless Entry Remote Battery Replacement

Watch the video on how to change the key fob battery on Audi keyless entry key fob also known as Audi smart key. This key fob is used many Audi cars since 2008 including A Q R S TT models. If your Audi key fob battery is too weak or dead it will prevent you from starting the car using the Start/Stop button. 

Battery Size: CR2032 (One)

Replacement Shell: Audi Smart Keyless Entry Fob Shell

Part number / FCC ID: IYZFBSB802

Instructions

  1. Use your thumb to press on the key release found in the chrome part of the key. 
  2. Pull the metal key blade from the shell. 
  3. Press the exposed plastic with your thumb and pull it out of the shell. 
  4. Remove the battery from your Audi key fob. Pay attention to the positive side of the battery. 
  5. Install a new battery into your Audi key fob. The positive should be facing the plastic side. 
  6. Press the battery holder and the metal key into the shell.
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3. Audi Remote Battery Replacement - Key 3

Battery Size: CR2032 (ONE)

Instructions

  1. Flip the metal key open.
  2. Use a small screwdriver to press the back cover of the key. 
  3. Pry out the back cover at the end of the keyfob. 
  4. The battery is inserted in the back cover. Pry it out and pay attention to the orientation of the positive side of the battery. 
  5. Press the new battery in back cover. 
  6. Press the back cover into the Audi key fob. 
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4. Frequently Asked Questions

  • Does the dealer need to program the key? 

No. The key will work and no programming is required to change the battery. If your Audi key fob does not work after you change the battery try the following. 

Open the Audi using the metal key. Next press the unlock button on the remote. Enter the vehicle and insert the key into the ignition. Lastly, remove the key from the ignition. 

If the key synchronization procedure does not work, open the key and make sure the positive (+) side of the battery is on the correct side.

  • Can I change the shell of the Audi key fob? 

Yes. If your Audi key fob is damaged or the shell is broken you can consider replacing just the shell. New Audi key shells can be purchased online. 

  • Is Audi key battery rechargeable? 

No. Audi does NOT use rechargeable batteries in their key fobs. It is ok to use a rechargeable battery. Keep it mind that once the battery dies, you will need to remove and charge the battery or simply replace it. 

  • My Audi key does not work after changing the battery. 

Open the key again and make sure the battery is installed the right way. Check that the positive (+) side of the battery is installed on the required side.

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