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Hello

 

I've just purchased a 2010 f11 touring 520d. When viewing the car there was a warning that the battery requires replacing when convenient. The seller (2nd hand car dealer) said this was because it's been standing for some time and 'should' go. Anyway I got a fair bit of money off because the front pads need replacing soon which I can do myself. Didn't want the dealer to complete this work as I prefer OEM parts.

 

Looking through the paperwork I found a small crumbled receipt which was a warranty for a battery fitted in 2019 from Halfords. Also in last years service (march 2020) it was noted that this warning light was on then. I've come to the conclusion that the battery may not have been registered by Halfords (if it was even fitted by them) back in 2019 leaving the warning there since then.

 

Am I right in thinking that for this warning to be corrected the battery needs to be registered correctly? If so can a two year old battery be registered as I've read elsewhere that it should only be a brand new one?

 

Any advice would be greatly appreciated.

 

Thanks 

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Welcome

 

A brand new battery of the correct electrical size needs registering to the car with diagnostics so the car knows its got a new battery in it as a new battery has a very different discharge/charge cycle to the one its just replaced.  Folk have changed their battery and not had it registered and report no issues.

 

If you fit a battery of a differing electrical size , it needs coded to the car again with diagnostics so that it knows to adjust the charging rate from a different sized battery.

 

Like most cars it will have sat around not doing much in 2020 so it could just be in need of a good charge.  I can recommend the Ctek MXS5.0 charger.    There may be a parasitic drain in your car which is affecting the charge in the battery if a charge doesn't help

 

4 minutes ago, Rob319zd said:

 

Any advice would be greatly appreciated.

 

 

Don't go to Halfords for work being done on your car, tools yes, servicing, no.

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Thanks for this! I'm now doing 70 miles commuting a day so hopefully that'll correct it. Otherwise it'll be put on charge at the weekend. 

 

I plugged an OBD2 icar in this morning seeing if theres any chance that would do anything (didn't) but what I did note was under the battery coding on Bimmer Tool it only had the options 90ah and 105ah for batteries. The one installed is 95ah, could this affect it by any chance?

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Not knowing the exact spec of your car, Realoem list three battery sizes for a 520d. 80, 92 and 105 Ah

 

https://www.realoem.com/bmw/enUS/showparts?id=MX12-EUR-06-2010-F11-BMW-520d&diagId=61_2369

 

But if its meant to be a 90 or 92 Ah battery and its a 95 Ah that's in it, I doubt it will give an issue unless the car doesn't know it has been replaced/coded.

 

Charge the battery in the car via the under bonnet terminals, never connect directly to the battery negative post as this bypasses the IBS.  See what happens after a proper charge.

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