Anyone ever check to see how much their battery drains on a typical day after the car sits overnight? I never really gave it much thought as long as the car started the next day, but I recently bought a Bluetooth FM transmitter which displays battery voltage when the transmitter first gets power. The unit consistently displays 10.4 volts, which seems low to me, but there's no problems cranking/starting the car. Volts are above 14 while engine is running, so alternator should be good. I'd be curious to know if anyone else monitors their battery voltage prior to the first start of the day. I figure 10.4 is either typical, my battery is telling me it's on its way out, or I have parasitic voltage draining the battery.