BMW M3 Forum (E90 E92)

BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   M3Post - BMW M3 Forum > M3 (E90 / E92 / E93) > Regional Forums > USA - Midwest / Rockies
 
Post Reply
 
Thread Tools Search this Thread
      09-20-2023, 03:48 PM   #1
bmckeeM3
Registered
0
Rep
4
Posts

Drives: 2008 M3 Convertible
Join Date: Sep 2023
Location: Denver

iTrader: (0)

Convertible M3 Dead Battery Conundrum

I have a manual transmission, 2008 M3 Convertible in Juarez Black that I named Jezabel and have owned since new and have put approximately 20,000 miles on. I moved to Denver and put the car in an enclosed car trailer that I own and parked the trailer in a rented storage garage given that my new home did not have enough garage space to keep all of my cars indoors -- and I didn't want this car outside. My intention was to find a permanent/conditioned storage home for the car over the next year so that I could easily get to the car and take it out for a spin now and again. Importantly the car was parked (stupidly upon reflection) with the top down. When I went to the car to fire it up after a few months in the trailer, the battery was dead. Not a big deal, it has happened before. I went home, retrieved my battery tender, went back down and plugged it in. Upon my return visit several weeks later, the battery was still dead...not a sign of life. I figured I didnt have a good connection, played with the clamps, made sure the Tender had power and left again...next return visit, same thing....no sign of life. I then began digging -what next???? I found that using the smaller of my battery tenders, i may not be providing enough juice to recover the dead battery/overcome the draw on the battery from all of the M3 electronics, which are apparently known to kill batteries. Fine, let's replace the battery....which happens to be in the trunk...under the convertible hard top that is neatly folded into the trunk. I slowly begin to recognize just how stupid i was to park the car with the top down. I travel a LOT for work and have limited time, limited auto repair skills and even more limited garage space. My research has yielded that getting to the battery and getting the top up without power is a rather involved process, and one that I cant do outside with any risk of weather. I have checked with a number of area shops to see if there is anywhere I can take the car in the trailer, back the trailer up to a garage and roll the car straight into and inside work bay where it can live until they (an experienced professional can do what needs to be done to get the top up, battery replaced, and now a thorough scouring of the car and all its components given that it has been sitting for a year + without running in an environment that is very dry/low humidity). That search has proven fruitless....everyone thus far has suggested i come unload the car in their lot and they will get to it when they can...that is a non-starter with the top down. I have continued to look for a permanent storage solution where I could unload the car and have time to work on it...or hire someone to come work on it and that has proven equally as challenging. I am scratching my head as I have a beautiful car that I love, want to drive and that I am paying dearly to store. Does anyone have any ideas, thoughts or suggestions relative to mechanics, storage places, or other approaches I should be thinking about to help me get Jezabel back on the road and part of my driving life?
Appreciate 0
      09-20-2023, 03:56 PM   #2
Pheonix
Captain
345
Rep
990
Posts

Drives: 2007 Z4 M Coupe 2012 e93 M3
Join Date: Sep 2008
Location: Bay Area, CA

iTrader: (8)

Garage List
2007 BMW/Z4MC  [0.00]
Can you open the hood?
Did you try to jump start the car? If you can't get the jumper cable to the car then get one of those Portable Lithium Battery starter and should work. The positive terminal is in the front.
Appreciate 0
      09-21-2023, 10:20 AM   #3
cloumeM
Lieutenant
160
Rep
463
Posts

Drives: BMW e93 M3
Join Date: Sep 2021
Location: St. Louis, MO

iTrader: (6)

Quote:
Originally Posted by Pheonix View Post
Can you open the hood?
Did you try to jump start the car? If you can't get the jumper cable to the car then get one of those Portable Lithium Battery starter and should work. The positive terminal is in the front.
Yes, this should do the trick. Positive terminal near the passenger side strut mount with a red cap under the hood.
Appreciate 0
      09-21-2023, 03:05 PM   #4
bmckeeM3
Registered
0
Rep
4
Posts

Drives: 2008 M3 Convertible
Join Date: Sep 2023
Location: Denver

iTrader: (0)

I did try to jump the car as well via the remote posts under the hood....nothing (apologies-
I should have included that in my overview).
Appreciate 0
      09-21-2023, 04:29 PM   #5
bmckeeM3
Registered
0
Rep
4
Posts

Drives: 2008 M3 Convertible
Join Date: Sep 2023
Location: Denver

iTrader: (0)

Quick note: when i tried to jump the car, i used a small battery jump box. I have heard that some of the bigger more 'industrial' jump boxes are much more effective for VERY dead batteries. Any experience with this? I would be willing to invest in (or rent) a bigger jump box if i thought it would work.
Appreciate 0
      09-21-2023, 04:52 PM   #6
Pheonix
Captain
345
Rep
990
Posts

Drives: 2007 Z4 M Coupe 2012 e93 M3
Join Date: Sep 2008
Location: Bay Area, CA

iTrader: (8)

Garage List
2007 BMW/Z4MC  [0.00]
I would definitely want to try a larger battery pack.
Hopefully it was a matter if giving it enough juice. If not then you might have some other issues?
Appreciate 0
      09-21-2023, 05:28 PM   #7
bmckeeM3
Registered
0
Rep
4
Posts

Drives: 2008 M3 Convertible
Join Date: Sep 2023
Location: Denver

iTrader: (0)

Thanks Pheonix. Will see if I can find one and try it this weekend. Fingers crossed.
Appreciate 0
      09-22-2023, 11:25 AM   #8
cloumeM
Lieutenant
160
Rep
463
Posts

Drives: BMW e93 M3
Join Date: Sep 2021
Location: St. Louis, MO

iTrader: (6)

Definitely try the more potent jump source. Also, for leaving the car stored long-term, consider using the battery tender/charge unit. Some use the OEM one, but I found one from autozone and it worked great for me.

Here's the link to the tender: https://www.google.com/search?sca_es...=1132&dpr=1.31
Appreciate 0
      09-22-2023, 12:45 PM   #9
Pheonix
Captain
345
Rep
990
Posts

Drives: 2007 Z4 M Coupe 2012 e93 M3
Join Date: Sep 2008
Location: Bay Area, CA

iTrader: (8)

Garage List
2007 BMW/Z4MC  [0.00]
Not sure how emptied the OP battery is but I had good experiences bringing half death battery back to life with NOCO battery charger.
Appreciate 0
      09-23-2023, 09:37 PM   #10
Johnny E92
Private
Australia
62
Rep
69
Posts

Drives: BMW E92 M3
Join Date: Dec 2020
Location: Australia

iTrader: (0)

Hi I was away with work for 5 months and my E92 was dead as a door nail when I returned, not unexpected. I live in an apartment complex so a trickle charger is not an option unfortunately due to no power outlet in the parking bays in the complex.

It was that Ďdeadí that I had to use the manual key to open the door and the car wouldnít even power up, even the interior light was very very dim.

However I did get one of the lithium battery jump packs and used that on the terminals under the bonnet (hood) and it fired up almost instantly. The battery is only 18 months old and is an AC Delco battery and seem to have recovered and the car starts and runs fine now.

Iím not sure if the jump pack I got is available in North America as Iím in Australia, but if so I can highly recommend the one in the photos. If not just get a decent one and biggest one you can afford.

Cheers
Attached Images
   
Appreciate 0
      10-01-2023, 06:40 PM   #11
Nickco43
Lieutenant Colonel
Nickco43's Avatar
1422
Rep
1,901
Posts

Drives: 08 E92 BMW M3
Join Date: Apr 2018
Location: Denver, CO

iTrader: (1)

Garage List
2008 BMW  [0.00]
Quote:
Originally Posted by bmckeeM3 View Post
I have a manual transmission, 2008 M3 Convertible in Juarez Black that I named Jezabel and have owned since new and have put approximately 20,000 miles on. I moved to Denver and put the car in an enclosed car trailer that I own and parked the trailer in a rented storage garage given that my new home did not have enough garage space to keep all of my cars indoors -- and I didn't want this car outside. My intention was to find a permanent/conditioned storage home for the car over the next year so that I could easily get to the car and take it out for a spin now and again. Importantly the car was parked (stupidly upon reflection) with the top down. When I went to the car to fire it up after a few months in the trailer, the battery was dead. Not a big deal, it has happened before. I went home, retrieved my battery tender, went back down and plugged it in. Upon my return visit several weeks later, the battery was still dead...not a sign of life. I figured I didnt have a good connection, played with the clamps, made sure the Tender had power and left again...next return visit, same thing....no sign of life. I then began digging -what next???? I found that using the smaller of my battery tenders, i may not be providing enough juice to recover the dead battery/overcome the draw on the battery from all of the M3 electronics, which are apparently known to kill batteries. Fine, let's replace the battery....which happens to be in the trunk...under the convertible hard top that is neatly folded into the trunk. I slowly begin to recognize just how stupid i was to park the car with the top down. I travel a LOT for work and have limited time, limited auto repair skills and even more limited garage space. My research has yielded that getting to the battery and getting the top up without power is a rather involved process, and one that I cant do outside with any risk of weather. I have checked with a number of area shops to see if there is anywhere I can take the car in the trailer, back the trailer up to a garage and roll the car straight into and inside work bay where it can live until they (an experienced professional can do what needs to be done to get the top up, battery replaced, and now a thorough scouring of the car and all its components given that it has been sitting for a year + without running in an environment that is very dry/low humidity). That search has proven fruitless....everyone thus far has suggested i come unload the car in their lot and they will get to it when they can...that is a non-starter with the top down. I have continued to look for a permanent storage solution where I could unload the car and have time to work on it...or hire someone to come work on it and that has proven equally as challenging. I am scratching my head as I have a beautiful car that I love, want to drive and that I am paying dearly to store. Does anyone have any ideas, thoughts or suggestions relative to mechanics, storage places, or other approaches I should be thinking about to help me get Jezabel back on the road and part of my driving life?
A couple of weeks ago I had a very hard time trying to find a shop in Denver to perform a few maintenance items. All the shops I called said they were a month or two out. Only BMW of Denver Downtown said they could get the car in without a loaner fairly quickly. It seems to me like there is just a lack of any kind of good service shops in Denver. My buddy took his E class to Paddock Imports where they ended up improperly filling his transmission twice, messed up his command infotainment with a software update, damaging his center console and leaving fuses on the passenger side footwell.

I ended up taking my M3 to Honest Assembly Garage and I should have my car back tomorrow after about a three week wait (I had to source good used valve covers which was the bulk of the delay). I can't personally speak about the quality of work as I have not received my car back yet but I was very impressed with the attention to detail and knowledge the shop owner had when I dropped my car off. I was told they have 20 something bays and no cars are left outside which is probably the most important thing in your situation.
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 08:36 PM.




m3post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2023, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST