How to check the condition of the battery in my Audi 80?

I have been having problems starting my Audi 80 recently and I suspect it may be due to a faulty battery. I am not sure how to check the condition of the battery, can someone please give me some advice?

The best way to check the condition of your Audi 80's battery is to use a voltmeter. Start the car and connect the voltmeter to the battery terminals. A healthy battery will have a reading between 12.5-12.8 volts. If the reading is lower, it may indicate a weak or dying battery. It's also a good idea to have a mechanic perform a load test on the battery just to be sure.

Another way to check the condition of your battery is to visually inspect it. Look for any signs of corrosion or build up around the terminals. A clean and well-maintained battery is less likely to cause starting issues. If you do notice any corrosion, you can clean it off with a mixture of baking soda and water.