sounds like a busted relay? you could remove them one at a time, apply power, see if the clicking stops when a particular one is out.

 

Well hang on before you tow. I'm not sure what 98% charged actually means. I don't think in those terms but a fully charged battery is 12.6 volts resting. 98% of that is 12.34 volts which equals a dead battery. What is the actual voltage showing at the battery terminals? Any auto parts store will load test the battery for you at no cost.

 

I read that you have a new battery in your first post but humor me and read out the voltage at the terminals please.

 

We have had at least two, if not three X150’s towed to the shop in the past 3 or so years because of this power stud (primarily on the underside of the car) being corroded. They also had the same issue as you did, good battery voltage but still dead. I highly recommend cleaning and tightening the nuts and cables on the top and bottom side of this power stud.

 

I had something similar happen, ended up being a faulty ground.