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MKH
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Posts: 638
Joined: Fri Nov 02, 2018 5:48 am
Location: Dallas

Re: 12 volt battery depleted

Sat Jul 25, 2020 2:11 pm

Has anyone found non-dealer mechanic/service options for the i3 in their area? We have several BMW/European specialist mechanics locally
I found a good well reviewed independent BMW service garage near me, run by two former dealer/factory BMW mechanics (they only service BMWs). They are not i3 trained, but more than willing to do the normal oil/brake fluid/brake pads, etc. service - at rates lower than the BMW dealership. I think if something goes wrong with the i3 specific 'bits'' it might be dealer-only, though.
Last edited by MKH on Sun Jul 26, 2020 6:17 am, edited 1 time in total.
Mark H.
2015 i3 Rex, Capparis White, Tera World, Technology & Driving Assistant, Parking Assistant, Harman Kardon Audio System, 19 inch 427 wheels, EVoInnovate EVSE

jadnashuanh
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Joined: Thu May 22, 2014 2:07 pm
Location: Nashua, NH USA

Re: 12 volt battery depleted

Sat Jul 25, 2020 6:23 pm

THere are various scan tools that can read the BMW specific error/status codes, so, with some knowledge, you do not need to be a BMW dealer's shop to at least be able to get an idea what may need fixing. Things like brakes are pretty straight forward as are the suspension bits. If you have the REx, an oil change isn't rocket science, nor is the muffler. There are some strange bits in the fuel system, and they may not be competent to deal with charging or battery issues, but that's not a given, either. Consider, though, that in a dealership, they may only have had a few of their techs trained on the i3, so as a system, not every tech can deal with them. When it might come to body work, especially when it might involve the CFRP chassis, probably best to not deal with other than the factory trained people (and I'm not sure they can get all of the frame parts, either).
Jim DeBruycker
2011 535i x-drive GT, 2014 i3 BEV
Soon (hopefully!) A 2021 X5 45e will replace the above

stohje
Posts: 4
Joined: Wed Jul 22, 2020 6:54 pm

Re: 12 volt battery depleted

Sat Jul 25, 2020 6:27 pm

Thanks for the reply Mark. I was surprised the top independent BMW mechanic in the area wouldn't do the simple things you mentioned. Too bad since the rex seems to need an oil change every week or so! :D Haven't checked with all locals so I'll keep trying.

Battery update:
Ran many errands today and got the battery warning once early on but didn't get it again. So weird. Maybe it was slowly recharging throughout the week. If it stays good, at least I'll have a spare when this one does finally quit completely.
Jeremy S.
2015 i3 Rex, Solar Orange Metallic, Tera World, Technology & Driving Assistant, Parking Assistant, 19 inch 428 wheels

User avatar
MKH
Gold Member
Posts: 638
Joined: Fri Nov 02, 2018 5:48 am
Location: Dallas

Re: 12 volt battery depleted

Mon Jul 27, 2020 8:15 am

Too bad since the rex seems to need an oil change every week or so! :D
Once a year doesn't' seem too bad to me. My previous ICE vehicle needed one about every four to six months. :cry:
Mark H.
2015 i3 Rex, Capparis White, Tera World, Technology & Driving Assistant, Parking Assistant, Harman Kardon Audio System, 19 inch 427 wheels, EVoInnovate EVSE

pmpleung60
Posts: 2
Joined: Sat Sep 26, 2020 10:09 pm

Re: 12 volt battery depleted

Sat Sep 26, 2020 10:24 pm

3

accessory battery long term storage
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3

r/BMWi3
•Posted byu/pleung6
6 hours ago
accessory battery long term storage
I want to share my experience with my 2017 bmw i3 with regards to long term storage.
Here are the facts:
Car unplugged in garage. March 20 123 mile capacity, April 20. 118 mile capacity, June 19 115 mile capacity (91%), Sept 20 105 mile ,
capacity, These measurements were taken by my friend who checked on the car. The car started no problem on Sept 20 ( 6 full months left unplugged) . He took it for a 35 mile drive ( theoretically to charge the accessory battery) and returned to the garage unplugged and store further reading 85 mile capacity (62%).
Before I left, I spoke with BMW service/mechanic in Scottsdale (Penske BMW) who said that the accessory battery will trickle charge by itself from the high voltage battery. Also, the manuals recommendation to leave it plugged in for long term storage is only because leaving it 100 percent charged is the lesser evil than unplugged and risking discharge to 0. Both are actually undesirable for lithium battery permanent capacity loss . The best discharge rate is between 75 % down to 60% for the battery and I was able to achieve this because I had a friend checking on the car to ensure it will not go below 60 (otherwise he would plug it in for me which did not happen).
There was no need to remove the accessory battery and trickle charge it (difficult to do for the average person).
I really however would like a high level BMW engineer to confirm thru this thread that indeed the accessory battery is trickle charged from the high voltage battery when placed just in storage unplugged. Because other than verbal from the mechanic, I cannot for the life of me find anywheres on the internet or in any other forum this statement. This has led to much advice regarding diving into the front of the car and risking high voltage shock and removing the accessory battery to attach a trickle charge to it. So please if anyone who has formal training in the design of this car's electronics, please confirm this mechanic's statement that the accessory battery is indeed trickle charged by the high voltage battery when left unplugged.
P.

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