One of my favorite tow calls was for the exact same car as me, 2001 Jeep Grand Cherokee. Being a Jeep guy, I take pride in getting any Jeep running or telling the member the exact problem.
So I show up, talk to the owner. He says the Jeep wouldn't start the day before , so he took the battery out and since he bought it at Les Schawb, took it there. They put it on the charger there for as understand, 8 hours, said the battery is fine now, and he should be good. He drives barely 30 minutes home, puts battery in, and it wouldn't do anything. So he calls AAA of course.
I took a look. First off the bat, battery is 7 years old from the date code, leaking out of vents and flat out just awful. Voltage is 5V. I tell him it's the battery and it will start with a jump. He didn't believe me, but was willing to let me try.
I put the jump pack on, lights come on, and turn the ignition, and guess what? Starter runs, and it catches...it's running!
Owner is baffled...and says "Les Schwab lied to me?"
I tell him yes, they had a tire tech work on a battery. Alternator is fine, so I show him the battery is toast after letting it run 15 minutes, then turning it off. Multimeter shows the voltage drop to 5V in seconds.
He asks me "What should do?" So I tell him, I'll follow you over to the same location of Les Schawb (up the street) and let's talk to the manager.
We show up there, manager was actually at the counter. Explained the story again, I show him the battery. Manager is really purplexed, but he looks in the computer and sees something that makes him mad. He looks at me and the owner, goes "Sir, I'm really sorry about this, we are going to give you a battery on the house!"