Low voltage after new battery

[Helmsman]

Originally Posted by Redd

How do I check? Cos right now I have zero errors or symptoms.

Have Carly? If so you have a check point of actual alternator current output which would be nice to confirm as a start. Should hover around 30-40 amps during normal conditions.

[Scharbag]

Originally Posted by pbonsalb

It goes from the oil pan to frame rail under the header collector on the driver’s side. They can rot out. Give it a tug.

This made me laugh.

I am such a child.

[Redd]

Originally Posted by Helmsman

Have Carly? If so you have a check point of actual alternator current output which would be nice to confirm as a start. Should hover around 30-40 amps during normal conditions.

I just ordered ISTA+. Will check this first thing the cable gets here. Thanks!

[Redd]

Update - After slightly over 1 month and 1000km, voltages are back up to 13.5-14V regularly. CTEK shows the battery is charging up to 100%.

I didn't do anything or change anything. Seems like the problem just fixed itself, or it's normal after a new battery registration.

[dpaul]

Originally Posted by Redd

Update - After slightly over 1 month and 1000km, voltages are back up to 13.5-14V regularly. CTEK shows the battery is charging up to 100%.

I didn't do anything or change anything. Seems like the problem just fixed itself, or it's normal after a new battery registration.

Registration is irrelevant. Hopefully the problem will not return.

[Helmsman]

Originally Posted by Redd

Update - After slightly over 1 month and 1000km, voltages are back up to 13.5-14V regularly. CTEK shows the battery is charging up to 100%.

I didn't do anything or change anything. Seems like the problem just fixed itself, or it's normal after a new battery registration.

Haha, always exciting to return to an old thread and find I thought I had it all figured out.

Well my turn - Replaced the battery. Once coding and register was confirmed (using Bimmergeek), I all of a sudden get increased charge voltage at 14.8V vs 14.3 isch with the worn out battery. Temperature has fallen to below 0 which apparently is being compensated by the ECU, but reading this thread an old battery apparently should be compensated with higher charge voltage puzzles me. I also went from AGM to flooded which again should lower the voltage if anything.
Yours has been fine since replacement or noticed any further odd behaviour Redd?

[Vuu]

Originally Posted by Helmsman

Haha, always exciting to return to an old thread and find I thought I had it all figured out.

Well my turn - Replaced the battery. Once coding and register was confirmed (using Bimmergeek), I all of a sudden get increased charge voltage at 14.8V vs 14.3 isch with the worn out battery. Temperature has fallen to below 0 which apparently is being compensated by the ECU, but reading this thread an old battery apparently should be compensated with higher charge voltage puzzles me. I also went from AGM to flooded which again should lower the voltage if anything.
Yours has been fine since replacement or noticed any further odd behaviour Redd?

In the same boat as both of you, except I live in SoCal.

Replaced the battery and get the discharged warning. Car has been on a tender ever since.

[Helmsman]

Originally Posted by Helmsman

Haha, always exciting to return to an old thread and find I thought I had it all figured out.

Well my turn - Replaced the battery. Once coding and register was confirmed (using Bimmergeek), I all of a sudden get increased charge voltage at 14.8V vs 14.3 isch with the worn out battery. Temperature has fallen to below 0 which apparently is being compensated by the ECU, but reading this thread an old battery apparently should be compensated with higher charge voltage puzzles me. I also went from AGM to flooded which again should lower the voltage if anything.
Yours has been fine since replacement or noticed any further odd behaviour Redd?

To conclude on this fwiw, turns out the battery mgmt system does more than I understood. This morning coming out from 20C garage the charge voltage on my new battery was 13.9V. On my way back home from office after a day in -5C, charge voltage was back up to 14.8V. So all seem good, temp compensated by the ECU more than I realized.

[Redd]

Originally Posted by Helmsman

Haha, always exciting to return to an old thread and find I thought I had it all figured out.

Well my turn - Replaced the battery. Once coding and register was confirmed (using Bimmergeek), I all of a sudden get increased charge voltage at 14.8V vs 14.3 isch with the worn out battery. Temperature has fallen to below 0 which apparently is being compensated by the ECU, but reading this thread an old battery apparently should be compensated with higher charge voltage puzzles me. I also went from AGM to flooded which again should lower the voltage if anything.
Yours has been fine since replacement or noticed any further odd behaviour Redd?

Mine has been fine aside from the initial period of low voltage. Consistent 13.8-13.9V while driving now. Like u said, I think the new battery registration does more than we realize.