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      02-11-2013, 08:54 PM   #17
4dimnzn
Life choice to have lots of BMW's instead ex-wives
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Drives: G87 M2 Z4M E46 Wagon 318ti
Join Date: Sep 2012
Location: Easton. MD

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Battery tender's are never a bad idea. There's a lot of complexities behind what I am going to say next, but here's the simple version: Lock the car if parked for an extended time and you don't have it on a charger. If you don't it's "standby" mode and will draw on the battery. This started with BMW's E90's and then E89's big time and somewhat in E85/86. The new F series are basically laptops that are never shutdown - they hibernate.

Google away - lots of information is out there on this including from BMW
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