vamudzengi
Member
Thank you very much.Hugo_za said:vamudzengi said:I also have to replace my battery. Was shocked to see the size of that battery. Anyway here is my question; does this battery really have to be a 105Ah? I am tempted to buy a smaller battery and I don`t how this will affect. I stopped using that start-stop thing.
Alternator will be fine with either 90 or 105 is fine as long as the car is told which battery is fitted. This coding is required in order for the energy management system to do its job efficiently. I just replaced the battery on the 6er too. At some point someone fitted a cheap as non AGM low capacity battery to it. It was no longer holding any charge. My build sheet listed a 90ah battery but I opted for a 105ah instead. Registered the change in ISTA, and coded the new value in esys (very important second step if not programming with ISTA). If I hadn't done this the alternator would be supplying insufficient power for the battery fitted.
For start stop it has to be the larger 105ah and it has to be AGM. Non AGM will have a much shorter lifespan.
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