Quote:
Originally Posted by 4dimnzn
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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Thank you. This does make perfect sense, and as such the car is locked, always locked actually.
As for the tender vs trickle... i've googled and searched in the past... but I value the opinions here quite a bit too. Remarkably I havent found a product description I really trust. yet.