[JimD]

I have another data point on the "don't drive enough" argument dealers seem to make at times. I parked my 2009 128i for about 3 weeks due to work on our house. The builder parked a dumpster in the driveway and I couldn't get out. I have a SUV so I just drove that. I thought the battery might have been run down partially because the trunk wouldn't open. I went out last night to charge the battery because the dumpster is gone now. Before I hooked up the charger I tried starting it and it started right up. Started again this morning and drives normally. The trunk problem is I didn't hold the "top up" button quite long enough, apparently. It was blinking and when I gave it another couple seconds the trunk opened normally.

So a 5+ year old battery functioned fine after 3 weeks of no driving and also no charging. Cars should be able to do this.