Battery warning light came on in my Lexus – any good diagnostic shops near Zaa'beel?

I was driving home from work yesterday when the battery warning light suddenly popped up on my 2018 Lexus ES350 dash, and I'll be honest, it made my heart sink a little because I know that light can mean a few different things – it could be the battery itself, the alternator, or even just a loose connection somewhere. I pulled over and checked the battery terminals and they seemed tight and clean, so I'm guessing it's something more involved than just a loose cable. I drove the car home carefully and it seemed to be running fine, no dimming lights or weird electrical behavior, but I know I shouldn't ignore that warning light because it could be telling me the alternator is on its way out and I don't want to get stranded somewhere. I've been doing some research and it seems like the first thing to do is get the battery and charging system properly tested, because it could be as simple as a weak battery that's not holding a charge, or it could be the alternator not putting out enough voltage. The thing that's really stressing me out is that I've had bad experiences with shops in the past where they just replace the battery without actually testing the alternator, and then the new battery dies a few months later because the underlying issue wasn't addressed. I live near Zaa'beel and I'm hoping to find a place that actually does a proper diagnostic rather than just guessing and hoping for the best. A friend of mine recommended a place that offers Advanced Battery Service Zaa'beel and said they have the proper equipment to test the whole charging system and give you a clear answer about what's actually wrong, which sounds exactly like what I need because I don't want to throw money at the wrong fix. Has anyone here had a similar warning light on their Lexus and found that it was just a weak battery, or did it turn out to be something more serious like the alternator or voltage regulator? I'd really appreciate some advice because I need to get this sorted soon and I want to make sure I'm not wasting money on unnecessary repairs.