@R snow: Hi.
hmm....... maybe a different perspective might be useful?
The 4 x adaptation channels that tell the hex19 module about your battery were put there by the car designers for a very good purpose. In the main, that purpose is to initialize (in part) the starting parameters for the car's Energy Management System (EMS) - which on the mk7 Golfs that are used in Australia is quite sophisticated.
Now, not ALL of these 4 x adaptation channels have the same value in the operation of the EMS, but they ALL have a purpose (VW is not in the habit of randomly adding to the channel database in a module)
For the purpose of your question - it's important to understand that the EMS in an Australian Golf (which is fitted with a battery monitor module that appears on the negative battery terminal - it's called "J367", see below) has both short-term and long-term functionality. Yes, modern EMSs (including the system used on MQB platform cars) are designed to optimize battery longevity and long-term battery performance. And, to do this - the EMS maintains a running history of every milli-amp that is extracted/injected from/to the battery. That's why it's necessary when using an external-charger, or when jump-starting a mk7 to use the car earth rather than direct connection to the battery negative terminal - because the recording device for battery current flow (J367) needs to be in-circuit.
So- the reason why you need to tell the hex19 module about the installation of a new battery is two-fold; to reset the car's history records for the old battery and to update the EMS with any changes about the new battery. Even if you are replacing like-with-like, the hex 19 module still needs updating (IMO)!!
Of course if these channels are not changed, the EMS will likely still satisfy the new battery's short term charging needs - but the EMS will assume that the old battery is still installed for the purpose of long-term battery functionality. This means that the EMS objective of maximizing battery longevity and long-term battery performance must be compromised!!!
Given that these are not cheap batteries - my hunch is that the extra effort needed to make the coding changes will likely deliver a financial return in the long-run and it will likely be better for this fragile blue planet (I reckon)!! Although I've no doubt that nay-sayers will claim that they have not observed any lessening of battery life when these changes are not made (how do they know?)!
So, bottom line = making the coding changes is good for you and more importantly (for me), it's good for us!!!!
Don
Last edited by DV52; 28-05-2022 at 06:51 AM.
Please don't PM to ask questions about coding, or vehicle repairs. The better place to deal with these matters is on-line, in the forum proper. That way you get the benefit of the expertise of the wider forum! Thank you.
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