My 307 car was starting weakly yesterday and today it didn't start.

Hello, I'm new here. My car is a 2004 307 1.4 HDi. Yesterday, while I was out, I started it three times and it started weakly (slowly). I thought something was wrong, but I made it home. Today, when I started the car, it started again slowly, made a loud clicking noise, and wouldn't start. Then, the airbag lights came on. When I tried again, the starter didn't even turn, and it made another clicking noise. When I locked the car with the remote, I noticed that even the locking speed had slowed down significantly. I'm not very good at it, so my friend told me to check the battery color, and he described it as green. Has anyone had this problem before? If so, how did you solve it? Thank you very much. Happy forum!

Hello, check the battery terminals (is there any oxidation or looseness?), then measure the battery or have it measured by an auto electrician. Your battery may appear dead, or your alternator may not be charging.