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Old 20th January 2016, 04:43 PM
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Default Battery charge

Hi all.

I fitted a new battery, Bosch S5 before Christmas. Brother in law suggested it wasn't good as it was 12.7 volts. I said it was equivalent to 100% SoC, having googled it. I then had a low battery warning, he tested it and it was 12.2. So I exchanged the battery at Eurocarparts on Monday. Today, having driven 70+ miles I had VCDS on it to add the Webasto menu to MMI. So I had a look at the battery regulation module. See pic. Is 12.4 low? On the battery there is a Bosch sticker that says 12.4. Should it be higher (12.7-13.2v) or am I missing something?

All the best.

John.
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Old 20th January 2016, 05:11 PM
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Hiya

Looks comparable to data from our new 110Ah battery in our S5 changed about the same time

Is there a battery management plug on the -ve terminal that needs disconnecting/reconnecting so it learns the new battery, and was new battery coded when fitted?

A
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Old 20th January 2016, 05:13 PM
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Cheers Adrian.

I coded the last one. Haven't coded this, but it's a like for like... Should I code it again?
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Old 20th January 2016, 06:13 PM
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The serial number needs changing to convince the battery management system that the battery is new.

Instructions attached, in case any steps have been missed, but doesn't appear that the battery management unit needs anything unplugging
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Old 20th January 2016, 06:15 PM
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Many thanks Adrian. I'll get that done tomorrow
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Old 20th January 2016, 11:22 PM
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Is there any reason you're using a VCDS version so old as 11.11.3 when the latest release is 15.7.3 ?
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Old 21st January 2016, 06:24 AM
mannyo mannyo is offline
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Quote:
Originally Posted by Johnmed View Post
Many thanks Adrian. I'll get that done tomorrow
it needs coding so the ecu can reset all the learnt values of the old one. As the battery ages, so its charging time and required curve change, if you put a new one in then this requires the default set of rules. I've recoded the same battery on mine several times to reset the learned values which has resulted in the battery charging better than before.
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Old 21st January 2016, 07:38 AM
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Quote:
Originally Posted by Lee S View Post
Is there any reason you're using a VCDS version so old as 11.11.3 when the latest release is 15.7.3 ?
No. No reason Officer.
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Old 21st January 2016, 10:07 AM
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Sorry John... Wasn't having a dig.. I was just wondering if the older versions may have had functionality that had been written out of newer versions, that's all.
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Old 21st January 2016, 10:09 AM
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Quote:
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Sorry John... Wasn't having a dig.. I was just wondering if the older versions may have had functionality that had been written out of newer versions, that's all.
I wish it was for that very reason Lee
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