[Nextgrid]

True but it will at least confirm that the battery is dead, as opposed to something else. I remember back when I was a kid my parents' car would not crank (you hear the solenoid engage but the engine doesn't turn) and nobody had any idea what it was (if you're not a car person and this never happens to you it might not be obvious especially considering all the other electricals still work fine on the slightly lower voltage). A voltmeter showing below 12V or a "low battery - <12.2V" light would've quickly cleared that up.