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I keep a small digital voltmeter in the 12v socket. I push it all the way into the socket and then turn the car key to first position. Momentarily it reads 12.4v then jumping to 14.4v as the DC-DC turns itself on. So that means the 12v battery is OK since some of the car's electrics are loading it. If the car has been unused for a few weeks the reading is like 12.2v which is not surprising with a 5 year old battery. But with this aging 12v battery my plan is to disconnect the 12v when I plan to be away for more than several days.

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