comprehensive is one of those big words that mean nothing. like " comprehensive illegal immigration reform " . As to your car batt , It just means they will check everything.

As to a car battery. What they do is a" load test " on the battery. And check the battery cable connections. That is all they can do. A load test tells if the batt is good or bad. You can google " car battery load test " if you want to learn what that is.

It's a test under controlled load (in A) conditions, where voltage across terminals should stay above a given threshold value. If the reading is below, the battery is bad and is best replaced - if above, it can probably resist another winter.

Hi that is when a load is put on the battery which simulates heavy use to check that the battery is holding up.

Normally $110? For what? An OIL CHANGE?

How old is the battery? Where do you live? Year/make/model etc. WE NEED INFO!!!