5th February 2016, 02:00 PM
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Senior Member
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Join Date: Dec 2014
Location: Cheshire
Posts: 1,601
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Quote:
Originally Posted by JulianHicks
1. Easy to see why you thought this Lee but actually the 150 A is the last two parts of the part number. The original Audi battery just happened to have a part code that matched its 'Amp Hour' value. 
VAG parts are xxx yyy zzz nn = vehicle subsystem part version
2. The Battery Meter % and its associated SOC values in the ECU that you read out with VCDS is one of the mysteries of life. The ECU calculates it and its value is shown in the MMI display but no-one knows what formula is used to determine it. I think Audi gave up on it, which is why it was removed at one of the MMI updates. After problems, I've seen the number 'stuck' at 10% on my car for three days before it magically returns to 100%, so don't trust it. 
3. Best bet for working out the battery SOC is to use a volt meter across the battery. - 100% is 12.6V, 75& is 12.4V, 50% is 12.1V, 25% is 11.9V - all approximate values for 'normal' temperatures - Spring in the UK! |
Thanks for the clarification Julian.
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2010 A8 SE Executive 4.2 FSI D4
2007 Mini Cooper S R56
2008 D3, gone, but not forgotten after 9 years and 90k.
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