Hmm, Maybe the power usage between 6 and 10 is a big change because the first time it happened was with no lights on or fan it was 40 minutes in (like I said I had to turn it on again after battery saver mode came up once).
Deftmetal might be right as well though, does anyone know how it gauges the low battery? Because I've not required a jump yet. Usually when the message pops up I freak out and turn the car to drive around for a bit. Never had it have a problem starting after the message though I have never left the radio on after the message.