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      09-07-2019, 02:48 AM   #1
wannabeemer
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Battery dying

N55 135i battery is beginning to sound strained when starting from cold. I'm with the RAC so are they as good as anyone else to source a replacement (they replace for free)?
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      09-07-2019, 08:18 AM   #2
MightyMouseTech
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BMW are not just drop in a battery and go. You have to register it, and capacity (NOT CCA) is very important. If you search, there are many, many threads about it.
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      09-07-2019, 09:32 AM   #3
wannabeemer
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RAC will register the battery and offer a model with 850 CCA.
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      09-07-2019, 07:24 PM   #4
John_01
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Please confirm the price, brand and specs when you are done.
I'm assuming its an AGM battery like the one in my car pictured here.
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      09-08-2019, 01:55 AM   #5
wannabeemer
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Would you know the CCA rating of the original battery?
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      09-08-2019, 02:18 AM   #6
John_01
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I have still got the original battery in my 135i from factory in 2011. Just reading from the label it says "12V, 70Ah, 760A, 760CCA"
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      09-08-2019, 02:46 AM   #7
wannabeemer
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Thanks. I don't know what 760A means do you?
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      09-08-2019, 03:04 AM   #8
John_01
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I don't know, but I assumed it was a current rating as its the same as the 760CCA.
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      09-08-2019, 03:08 AM   #9
wannabeemer
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Ok, I've got a quote from Budget Batteries for an 80AH 760CCA AGM with 2 years warranty for $340 fitted and registered which I'll go for. I don't see the point in getting another with a higher CCA rating.
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      09-14-2019, 07:19 PM   #10
wannabeemer
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Just an update that I went with that battery. Quick replacement though the registration took a little longer due to the scan tool not recognising the N55 engine. The guy switched to another scan tool and all was good.
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