If you measure the voltage immediately after the end of a drive, it should be more like 13.2, and drop to 12.7 within a few minutes as the chemical reactions in the battery slow down and stop when you stop charging it. If you have had the battery continually undercharged for 6 months, it may have lost a lot of capacity. Given your driving history, I would guess this isn't a "parasitic draw" problem at all. Is this voltage drop acceptable, and is there a diagnosis other than a parasitic draw that I can test myself or ask a mechanic to look into? I asked the technician at the dealership is this voltage drop was acceptable and he gave me a "sometimes that happens" answer. My conjecture is that there is some parasitic draw which is draining the battery over an extended period of time, but I do not have the equipment necessary to test it myself.
This means that both overnight (~14 hours) and while I'm at work (~10 hours), the voltage is dropping from 12.7 (fully charged) to 12.1 (barely charged). In addition, the voltage with the engine turned on is consistently 14.4 V or higher. The results are, consistently, as follows: In the meantime, I've been checking the voltage daily with a multimeter. In addition, I have brought my car to the dealership where they re-confirmed that the battery system was fine. Since asking that question, I have kept my same commute, but have been driving consistently 30+ miles on the weekend. This is a follow up to this question that I asked previously.
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