Multiecuscan

The EFB battery is failing in my Stelvio 2.2 diesel, and it seems a AGM battery is better, I understand that a new battery has to be be registered with the cars ECU, can MultiECU do this for me?

Had a look around in MES and can not find anything with battery replacement. I did find a option you have to execute if you replace the intelligent alternator.

You can put a AGM battery in an EFB system, but buy a good brand battery (expensive) like a Varta or a Bosch battery. In most cases you can put a bigger size battery in. When the cars come out of the factory (don't know it is the same with Stelvio) they have a too small battery for the size of the tray they are in. Bigger is better in this case.

Make sure you don't lose power on the car, hook the car up to a second battery via the jump points under the hood, so that the car doesn't lose its memory.

I believe that the need for registering a new battery is one of those false stories that get spread.

After battery replacement the Intelligent Battery Sensor and associated software will take a while to recalibrate automatically. Until its done so any readings of Battery State of Charge may be wrong.

I wonder why there's
Battery type at Body → CAN Setup
byte 63, bit 5: if it's supposed to be intelligent.

akukoba1 wrote: ↑24 Aug 2025, 14:23 I wonder why there's
Battery type at Body → CAN Setup
byte 63, bit 5:

Code: Select all

xxxx0001 - 80Ah 680A - default setting for Giulia/Stelvio EU
xxxx0010 - 95Ah 800A - default setting for Giulia/Stelvio US
xxxx0011 - 80Ah 680A - default setting for diesel Giulia/Stelvio
xxxx1000 - H7 flooded;
xxxx1001 - H7 AGM;
xxxx1010 - H8 flooded;
xxxx1011 - H8 AGM - default setting for Giulia/Stelvio MY20 models US/EU

if it's supposed to be intelligent.

you can try changing this value according to your battery type but as far as I remember sometimes it doesn't work or throws errors in engine ECU/BCM after change. might be something to do with IBS sensor type/version and BCM software version.

the question is if it's necessary to manually change this value if you go from factory installed Varta EFB 80Ah to aftermarket AGM 95Ah. Because I switched to AGM 95Ah and it's constantly undercharged. I.e. IBS never gets it to full charge, thus start stop warnings all the time.

1) da istruzioni di riparazione (eLearn) non è prevista nessuna codifica in caso di sostituzione batteria;
2) è una miglioria passare da efb a agm;
3) a mio parere è abbastanza inutile maggiorare la batteria da 80ah a 95ah. La batteria 95ah è prevista (in europa) solo per le vetture con l'optional pack climi freddi;
4) se hai problemi di mancata ricarica comunque verifica che funzionino correttamente alternatore intelligente e ibs.

Ciao

And how do I check that the smart alternator and IBS are working correctly?

akukoba1 wrote: ↑30 Aug 2025, 06:03 the question is if it's necessary to manually change this value if you go from factory installed Varta EFB 80Ah to aftermarket AGM 95Ah. Because I switched to AGM 95Ah and it's constantly undercharged. I.e. IBS never gets it to full charge, thus start stop warnings all the time.

you could have already changed proxi and tested if it helped with your problem or not.

akukoba1 wrote: ↑30 Aug 2025, 06:03 the question is if it's necessary to manually change this value if you go from factory installed Varta EFB 80Ah to aftermarket AGM 95Ah. Because I switched to AGM 95Ah and it's constantly undercharged. I.e. IBS never gets it to full charge, thus start stop warnings all the time.

This is definitely "a thing". The charging profile of lead acid (EFB included) is different to an AGM battery. I found this out after quite a bit of head scratching. My Jeep Renegade Trailhawk would never fully charge the AGM replacement in the years it was fitted, but when I went back to an EFB all was well with the world again.

So yes, it's a strong possibility that changing this setting would help.