vreihen
Posts: 128
Joined: Tue Apr 30, 2019 4:55 pm
Location: Orange County, NY (FN21vm)

Re: My i3 is Dead

Sun Jul 07, 2019 7:49 am

From a quick web search, it appears that the 40 Ah battery was made by Douglas. I can't find a cross-reference to their part number, though.

A few e-commerce sites listing the BMW part number also include suggestions for battery tray, hold-down bracket, and terminal adapters. Don't know if they are available or even i3 parts, given the weird nature of web store suggestions.

I would love to do the 40Ah retrofit if it was possible to code/register the larger battery. My late production 2015 BEV is probably living on borrowed time with the original 12V battery at this point, and I plan to change it before winter as a maintenance item.....
2015 BMW i3 BEV, Giga World, Tech and Driving Assistant packages, 15K miles

alohart
Posts: 1686
Joined: Sat Nov 01, 2014 7:36 pm
Location: Honolulu, HI

Re: My i3 is Dead

Sun Jul 07, 2019 12:21 pm

vreihen wrote:
Sun Jul 07, 2019 7:49 am
A few e-commerce sites listing the BMW part number also include suggestions for battery tray, hold-down bracket, and terminal adapters. Don't know if they are available or even i3 parts, given the weird nature of web store suggestions.
One i3 owner who installed the 40 Ah battery reported that the windshield washer fluid tank had to be relocated as well as fitting a different battery tray and hold-down brackets. He recommended against attempting this installation due to what was necessary.
vreihen wrote:
Sun Jul 07, 2019 7:49 am
I would love to do the 40Ah retrofit if it was possible to code/register the larger battery. My late production 2015 BEV is probably living on borrowed time with the original 12V battery at this point, and I plan to change it before winter as a maintenance item.....
Why would you want to install a standard flooded-cell lead acid battery that weighs probably twice as much as the 20 Ah absorbent glass mat battery? The 12 V battery doesn't have to have sufficient power to start an ICE engine at low temperatures. The i3's DC-DC converter turns on to provide ~14.3 V to the 12 V system whenever the 12 V system voltage drops below a certain level or the 12 V current load exceeds a certain level, so the 12 V battery isn't very stressed. When the DC-DC converter is on, the effective capacity of the 12 V battery is that of the Li-ion battery pack.
Aloha,
Art

2014 BMW i3 Arravani Grey, Giga World, Tech + Driving Assist, Parking Assist, DC Fast Charging, JuiceBox EVSE

vreihen
Posts: 128
Joined: Tue Apr 30, 2019 4:55 pm
Location: Orange County, NY (FN21vm)

Re: My i3 is Dead

Sun Jul 07, 2019 2:26 pm

alohart wrote:
Sun Jul 07, 2019 12:21 pm
Why would you want to install a standard flooded-cell lead acid battery that weighs probably twice as much as the 20 Ah absorbent glass mat battery?
Yikes! I didn't realize that it wasn't an AGM. The ~$115 price at a dealership should have been a clue that it wasn't AGM, though. :(

The reason why I wanted a bigger battery is because I want my dashcams and two-way radio with APRS tracking powered on 24/7/365, and might not drive it for weeks at a time. Doesn't look like I will be able to do it, though.....
2015 BMW i3 BEV, Giga World, Tech and Driving Assistant packages, 15K miles

Fisher99
Posts: 86
Joined: Sun May 12, 2019 6:24 pm

Re: My i3 is Dead

Sun Jul 07, 2019 7:01 pm

IT'S ALIVE!!!!

Just spent the week vacationing at the beach and picked up a 12v battery on my way home. Installed it a few minutes ago and everything lit up. It complained that it had zero charge, which I thought was interesting because the last I looked at it before everything quit, it said it was at 95.5%. But then I have had problems with the battery seeming to drain faster than I think it should when it's not plugged in (I have another thread on that topic) so figured I really did have a big battery drain problem. Still, that seemed strange because while it sat for the week unplugged, I also had the traction battery disconnected. In any case, after it sat for about 15 minutes I noticed that the light was no longer flashing on the charge port so checked it and it was sitting at 100%. Seems like it took it a little while for it to sort itself out after I connected the 12v battery.

So, all is well now, and I learned something about the i3, so that's a bonus.

Question: Would I have been able to disconnect the traction battery, then connect my portable 12v jump start battery to the 12v battery, and then be able to raise and lower the windows, and maybe even shift the car into neutral so that it could be moved? Seems like that should work.

Again, thanks to everybody for the info and moral support during this somewhat frightening experience!

frictioncircle
Posts: 39
Joined: Fri Nov 25, 2016 11:23 pm

Re: My i3 is Dead

Sun Jul 07, 2019 10:45 pm

alohart –

Thanks for providing the detail that the 40Ah battery is lead-acid.

No way I want that heavy junk in my CF EV machine!

alohart
Posts: 1686
Joined: Sat Nov 01, 2014 7:36 pm
Location: Honolulu, HI

Re: My i3 is Dead

Sun Jul 07, 2019 11:22 pm

Fisher99 wrote:
Sun Jul 07, 2019 7:01 pm
Question: Would I have been able to disconnect the traction battery, then connect my portable 12v jump start battery to the 12v battery, and then be able to raise and lower the windows, and maybe even shift the car into neutral so that it could be moved? Seems like that should work.
With the high-voltage system disconnected, drive readiness state cannot be entered, so nothing that requires this state would function. However, some lower operation state can be entered as indicated by the instrument screen turning on with a message stating that the high-voltage system is disconnected, so I think it's likely that the windows could be raised and lowered, but shifting into neutral might be possible only in drive readiness state.
Aloha,
Art

2014 BMW i3 Arravani Grey, Giga World, Tech + Driving Assist, Parking Assist, DC Fast Charging, JuiceBox EVSE

vreihen
Posts: 128
Joined: Tue Apr 30, 2019 4:55 pm
Location: Orange County, NY (FN21vm)

Re: My i3 is Dead

Mon Jul 08, 2019 3:20 am

alohart wrote:
Sun Jul 07, 2019 11:22 pm
...but shifting into neutral might be possible only in drive readiness state.
What does "roller mode" in the instrument panel's service menu do? If it puts the car into neutral, I wonder if it needs the traction battery power to turn off the parking brake and stuff?????
2015 BMW i3 BEV, Giga World, Tech and Driving Assistant packages, 15K miles

User avatar
MKH
Gold Member
Posts: 322
Joined: Fri Nov 02, 2018 5:48 am
Location: Dallas

Re: My i3 is Dead

Mon Jul 08, 2019 4:45 am

What does "roller mode" in the instrument panel's service menu do
On BMW ICE vehicles it puts the car into roller dynamo mode, where the car doesn't try and downshift when the accelerator is floored while the car is on a dynamo for testing. Maybe on the i3 it shuts off regenerative braking during dynamo testing??
Mark H.
2015 i3 Rex, Capparis White, Tera World, Technology & Driving Assistant, Parking Assistant, Harman Kardon Audio System, 19 inch 427 wheels, EVoInnovate EVSE

alohart
Posts: 1686
Joined: Sat Nov 01, 2014 7:36 pm
Location: Honolulu, HI

Re: My i3 is Dead

Mon Jul 08, 2019 7:56 am

MKH wrote:
Mon Jul 08, 2019 4:45 am
What does "roller mode" in the instrument panel's service menu do
On BMW ICE vehicles it puts the car into roller dynamo mode, where the car doesn't try and downshift when the accelerator is floored while the car is on a dynamo for testing. Maybe on the i3 it shuts off regenerative braking during dynamo testing??
Others have written that roller mode turns off traction and stability control and antilock braking as well.
Aloha,
Art

2014 BMW i3 Arravani Grey, Giga World, Tech + Driving Assist, Parking Assist, DC Fast Charging, JuiceBox EVSE

vreihen
Posts: 128
Joined: Tue Apr 30, 2019 4:55 pm
Location: Orange County, NY (FN21vm)

Re: My i3 is Dead

Mon Jul 08, 2019 8:39 am

Didn't Volkswagen get into a whole boatload of trouble because of their special computer coding for running on the EPA's testing dynos? :shock:

Why do I suddenly have the desire to borrow an ICE for the day and see if BMW also changes the emissions mappings in roller mode?????
2015 BMW i3 BEV, Giga World, Tech and Driving Assistant packages, 15K miles

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