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      07-01-2012, 12:22 PM   #24
Bob Shiftright
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Drives: E91 Schleppwagen
Join Date: Jan 2012
Location: PRNJ

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Originally Posted by John 070 View Post

What is this "trickle charger" that you mention, what make, model.

It's the one BMW is/was selling. I purchased it after my first battery was replaced under "goodwill" and I was told I didn't drive the car enough. (Which I freely admit. I don't have the time.) The charger/battery maintainer came from the BMW parts department. It has a BMW PN and a BMW roundel on it (no doubt allowing it to command the price premium over the nearly identical Chinese product sold on Amazon without the BMW roundel.)

The latest iteration of the car's ongoing electronic problems seems to have strained the battery. However, I made certain that it was completely charged before taking it to the dealer for the repair. However, it looks like they kept it in the programming bay over night without putting it to sleep, and after I picked the car up the poltergeists that appeared when my first battery started dying have reappeared. Since BMW doesn't warrant their batteries, I have the choice of either paying BMW $450 for a BMW battery with no warranty, or paying $200 for an Interstate battery with a warranty. The choice seems so obvious that it shouldn't even merit any discussion.

I have not been impressed by either BMW batteries or BMW customer service at this point. Interstate, WalMart and Sears are able to warrant their batteries and still make a profit. And I'm happy to pay for a $200 Interstate battery with a 30 month free exchange. Over 2 years, that will cost me about $0.25 per day. $0.12 if it needs replacement in another 2 years.

Note that I can leave any of our Japanese cars for days and days without them being driven and the battery is never a problem.

To be fair, the battery discharge issue seems to be a Porsche problem, too. Electronics just aren't the German car industry's forte.

It's OK if German cars are hard on batteries, I like driving German cars, I can afford it, and I don't have a problem with it. I just want the car to work. So if anyone knows what model Interstate battery will fit in an E91, I would appreciate the information, since posters have indicated that the battery that Interstate lists for the E9x won't fit.
E91 Sports Wagon 27K miles, 6-speed, RWD, (reportedly 1 of 429 built for the US market), Alpine, Terra, Xenons, ZSP, ZCW, ZPP, PDC, CA, alarm, M shifter and M brake handle, Euro rear fog light switch, Euro aspheric mirrors, rear power outlets, Euro split armrest, Garmin nüvi custom cupholder mount, Lidatek, V-1 rear headrest mount and built-in remote display, Cocomats (back to the 1970s!), $10 clutch stop mod.