Why is my Audi A2's battery not holding a charge?

I recently noticed that my Audi A2's battery is not holding a charge like it used to. What could be causing this and how can I fix it?

There could be a few reasons for this issue. The first thing to check is the battery terminals. Make sure they are clean and securely connected. If they are dirty, use a wire brush to clean them. If they are loose, tighten them with a wrench.

Another potential cause could be a faulty alternator. The alternator is responsible for charging the battery while the car is running. If it is not working properly, your battery will not hold a charge. You can have a mechanic test the alternator to confirm if this is the issue.