How do I fix the battery drain in my Audi A2?

Recently, I have noticed significant battery drain in my Audi A2. The car struggles to start and even when it does, the battery seems to drain quickly. What could be causing this issue and how can I fix it?

One possible cause for battery drain in Audi A2 is a faulty alternator. Check the alternator for any signs of damage and replace if necessary. Additionally, make sure all connections to the battery are secure and clean.