How to prevent battery drain on my Audi 80?

I have noticed that my Audi 80's battery is draining much faster than usual. What can I do to prevent this and extend the lifespan of my battery?

Make sure to turn off all electrical components when the car is not in use, such as the radio and lights.

Regularly check and maintain your battery's fluid levels to ensure it is working properly.

Consider investing in a battery maintainer to keep your Audi 80's battery charged when not in use.