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.
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.vreihen wrote: ↑Sun Jul 07, 2019 7:49 amI 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.....
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.
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.Fisher99 wrote: ↑Sun Jul 07, 2019 7:01 pmQuestion: 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.
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?????
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??What does "roller mode" in the instrument panel's service menu do
Others have written that roller mode turns off traction and stability control and antilock braking as well.MKH wrote: ↑Mon Jul 08, 2019 4:45 amOn 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??What does "roller mode" in the instrument panel's service menu do