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      01-23-2021, 12:15 PM   #1
KRS_SN
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time for new battery?

My F15 x5 has shown random error on cold starts such as chassis management and adblue error on days when temp has been < 0 degrees Celsius and this clears up when I stop and restart the car

I scanned with bimmerlink no permanent errors shows. and 105 AGM Battery charge is 48% this seems constant each time I checked it with bimmerlink.
Also 5 years and 60k miles since last battery was changed.

Should I
a. Replace Battery
b. Try trickle charger
c. do nothing and wait for winter to pass

If a.
Go OEM
or try bosch/exide
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      01-23-2021, 01:47 PM   #2
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Depends on how often your drive, but after 5 years in cold conditions it might be a good time to get a new battery so you are not stranded one day. OEM vs aftermarket part in my opinion is whatever is cheaper, as far as specs are the same.
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      01-23-2021, 02:57 PM   #3
scotty339
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Id hook it up to a good battery charger and let it run its conditioning program and see what happens from there. AGM's are finicky and like alot of voltage to be happy.

Worth a shot and by far the cheaper option before replacing batteries. If it does not work, and you still have the replace them (one or both) then you'll have a tender to keep up the charging on your batteries going foward.
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      01-24-2021, 02:25 PM   #4
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If you use a lot of the electronics/accessories, after 5 years/60K it might very well be time to change. Sure, you could probably squeeze out a bit more use, but a new battery is inevitable, and preventative maintenance now might save you headache down the road.
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      01-24-2021, 09:39 PM   #5
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I am a big believer in tickle chargers , my m3 still has its original 2010 battery in it and it is 95% still ...
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      02-14-2021, 04:25 PM   #6
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ok so it was -7 c. The car said go for a long drive or connect external leads. I took her out for a 30 minute spin. warning went away but I thought I can't be bothered with the faff of no start/ slow charging etc so called bmw they quoted £500 fit of battery and would need to take the car and leave it at the dealership for 24 hours.
Tried RAC. Got a varta 105 agm battery for £290 suppy fit n coded and registered at home in 24hours.
Mrs says the turbo lag is gone and car runs faster and smoother too:
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