How to maintain the Audi A2's battery life?

I have noticed that the battery life of my Audi A2 is not as long as it used to be. What could be causing this decrease in battery life and how can I maintain it?

First, check the age of your battery. If it's over 3 years old, it's time for a replacement. Secondly, pay attention to how often you use your car and how long it sits without being driven. Frequent short trips can drain the battery faster. Lastly, consider investing in a battery tender to keep the battery charged when not in use.