The Audi TT MK3 key fob battery is a small lithium-ion battery that is used to power the car’s keyless entry system. It can also be used, in certain models, to lower and close the windows and fold in the wing mirrors by holding down the unlock (open) and lock (close) button. When your remote no longer works it’s because its battery has died. And because these batteries are non-rechargeable, they have to be replaced with a new one.

Note: It is important to use the correct type and size of battery specified by the manufacturer. If the key fob is not working after replacing the battery, it may require to reprogrammed by a dealership.

Replacing the battery is simple, and you can do so by following these steps:

Step 1: Press and hold in the 2 black buttons on either side of the bottom of the key at the same time.

Step 2: Slide the key out from the fob.

Step 3: Pinch the 2 black tabs on the fob and pull back, revealing the battery.

Step 4: Remove the old CR 2032 battery from its holder and replace with your new one.

Step 5: Then, repeat this process in reverse and test your new battery works.

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How To Dispose Of Non-Rechargeable Coin Cell Batteries

To safely dispose of your old battery you can take it back to the store you bought your new one from. Or, you can take it to a recycling facility where they should be able to dispose of it safely.