To elaborate on my own situation:

I have a new battery (replaced it last January when the old one reached end-of-life), and I have a good set of jumper cables.

But I do leave the lights on once in a great while, same as anyone else, and the car doesn't have a warning signal.

So this is backup for when there's no one around to get a jump from, something I can try before I try to pop-start it.