Hope this post won't be too long/convoluted. Bought a used 2011 750Li (F02) in late Sept. Dealer said the battery was new. Wisconsin winters can be harsh and a week ago, temps around 15 degrees, and after not driving the car 3 days due to bad weather, I drove it to visit someone 22 miles away, almost all highway driving. Started up no problem. Leaving my visit, computer screen flashed battery charge was low and I needed to drive the car more. Drove it home, let it sit in the garage an hour, started it up, and got the same message, and the screen also read it was shutting down some electronic components to preserve battery charge. Took it in to a local BMW dealer. They ran some tests and said the battery was fine and if I wasn't driving the car that often (and is not driving 3 days really enough to cause this problem ?), I should have it on a battery charger. I figure they didn't find a blown fuse, didn't report any abnormal electrical draw, so all is OK ? Picked up a Duracell Ultra automatic battery charger, 1.5Ah, 4-stage charger and hooked it up. Felt really stupid having to do this, as until recently, I drove Hondas, and never had to do anything like this to any of them. Battery charged fine and in driving it today, I come home, hook it up to the charger, and it took forever for the "25%" charge light to switch over to "50%" charge. I use almost none of the electronic features, maybe the radio on a good day. Otherwise, whatever electrical draw may occur is whatever the car itself is doing. So, I got out the owner's manual again. Looked at instructions for starting the car and turning it off. To start it, I put a foot on the brake pedal and push the start button. No problem with that. To stop, it said to put my foot on the brake pedal, have it in "P" (Park), push the start button once, and set the Parking brake. In the time I've owned the car, I've never set the parking brake. For the uninitiated, Wisconsin (like Illinois) is a relatively flat state. When I stop, I've been stopping the car by foot on the brake, putting it in park, pushing the start button to turn it off, removing my foot from the brake, and pushing the start button again with my foot off the brake, which seems to turn off the speedometer light, computer screen, and radio off. Not pushing the start button twice leads to all internal lights and computer screen remaining on for around a minute or so, which I thought could contribute to shorter battery life. So, I have to ask, shutting down the way I had been doing until today, was I leaving the car "on", adding to any unusual current draw ? Must the Parking brake be set at all times for the car to actually be "off" ? I turned the ignition on (no foot on brake pedal, pushed the start button once), set the Parking brake, and my battery charger was plugged in at the time. Charge shot up from 50% to 100% in a matter of seconds, which made me wonder if not setting the Parking brake meant the car was still "on". Any thought anyone has would be greatly appreciated. Maybe it's just me, but I find this car to be way over-engineered. I do love it, though.