New battery almost flat?

fosk · 11-30-2021, 06:18 AM

Hope I got this in the right forum!

I've got a 2010 320d ed, and I changed the battery as the one in there was very old - replaced with a new Yuasa AGM battery - did the replace battery on Bimmerlink - everything came on fine, but the second start I got a dash error, a car with 2 lines going up into it.

I noticed on BimmerLink it didn't have a charge percentage, took it out for a drive, and that's now at 3%! So I am guessing it was not delivered charged as it is meant to be?!

I assume this isn't normal, as every video out there shows BimmerLink showing new batteries at 99% etc. Should I just push them for a new one, or should I drive it for a while to see if it charges, that 3% did take a long drive though!

It was such a pain to fit as well.

fosk · 11-30-2021, 07:39 AM

Thought I'd go and register it again, and this time, it showed the battery at 97%, so registered again, and will see how that goes - hopefully it's okay now, not sure what is going on though!

charlie_m · 11-30-2021, 07:46 AM

Use a real voltmeter to measure the resting voltage and the voltage with the alternator charging.

Then use the hidden menu to get to the voltage screen on the dash. (Sorry, I don't know the sequence but google does). That will tell you if the car electronics are properly measuring the voltage.

Sounds like you have a problem with the current sensor, and that 3% is probably not accurate.

fosk · 11-30-2021, 08:48 AM

The 3% has changed to 96/97% now, and stayed that way thus far.

I can see on bimmerlink the voltage varies between high 13 and mid 14 roughly.

11-30-2021, 06:18 AM	#1
fosk Registered 0 Rep 3 Posts Drives: 320d ED Join Date: Nov 2021 Location: North Yorkshire iTrader: (0)	New battery almost flat? Hope I got this in the right forum! I've got a 2010 320d ed, and I changed the battery as the one in there was very old - replaced with a new Yuasa AGM battery - did the replace battery on Bimmerlink - everything came on fine, but the second start I got a dash error, a car with 2 lines going up into it. I noticed on BimmerLink it didn't have a charge percentage, took it out for a drive, and that's now at 3%! So I am guessing it was not delivered charged as it is meant to be?! I assume this isn't normal, as every video out there shows BimmerLink showing new batteries at 99% etc. Should I just push them for a new one, or should I drive it for a while to see if it charges, that 3% did take a long drive though! It was such a pain to fit as well.
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11-30-2021, 07:39 AM	#2
fosk Registered 0 Rep 3 Posts Drives: 320d ED Join Date: Nov 2021 Location: North Yorkshire iTrader: (0)	Thought I'd go and register it again, and this time, it showed the battery at 97%, so registered again, and will see how that goes - hopefully it's okay now, not sure what is going on though!
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11-30-2021, 07:46 AM	#3
charlie_m Private First Class 77 Rep 169 Posts Drives: 2012 328ix Join Date: Jul 2021 Location: SC iTrader: (0)	Use a real voltmeter to measure the resting voltage and the voltage with the alternator charging. Then use the hidden menu to get to the voltage screen on the dash. (Sorry, I don't know the sequence but google does). That will tell you if the car electronics are properly measuring the voltage. Sounds like you have a problem with the current sensor, and that 3% is probably not accurate.
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11-30-2021, 08:48 AM	#4
fosk Registered 0 Rep 3 Posts Drives: 320d ED Join Date: Nov 2021 Location: North Yorkshire iTrader: (0)	The 3% has changed to 96/97% now, and stayed that way thus far. I can see on bimmerlink the voltage varies between high 13 and mid 14 roughly.
	Appreciate 0 Quote