[catalzzy]

Hi,

I am almost going to replace the battery.

What is the minimum AH rating for this car?

It has active steering and active suspension.

What is the recommended battery brand?

[ezaircon4jc]

I'd (in fact, did) get the 105ah battery. From my experience, the dealer isn't significantly more expensive than a parts store. Their price also includes the registration & any necessary coding.

[Qsilver7]

If you have active steering…dont’ you have more than one battery?

If you use one of the online part database sites (enter the last 7 digits of your VIN)…and go to VEHICLE ELECTRICAL (or use the search feature and type battery)…you will see the batteries BMW used for your model. ‘

If you’re not familiar with any online part database sites…here’s one…click the link below to go to the diagram and part number index for the main batteries BMW used for the 520i:

• https://bimmercat.com/bmw/en/search/...0i/MYS/61_2369
• 

And here’s the auxiliary battery that is used if you have the active integral steering option:

• https://bimmercat.com/bmw/en/search/...0i/MYS/61_2623
• 

[catalzzy]

Hi.

Yes it does have active steering but i only see just one battery. Where is the extra battery from?

[catalzzy]

I got it. Its at the back boot. So its one battery rated at 105AH.

Another question. Can different battery brands rated 105AH will work?

Thanks

[Qsilver7]

Originally Posted by catalzzy

I got it. Its at the back boot. So its one battery rated at 105AH.

Another question. Can different battery brands rated 105AH will work?

Thanks

Yes...you can use other brand name AGM 105AH batteries. You just need to stay with the "type"...which in your case is AGM. If you were to install a regular wet (lead/acid) battery that was 105 AH...you would need to recode your car to inform the charging system that you've switched from AGM to regular lead/acid.

[catalzzy]

I agree. I would stay with AGM type but theres many brand out there like varta, banner, chinese brand, japanese ones