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Post by stevenv2 on Jan 31, 2018 15:42:58 GMT
I have placed a new battery, Varda AGM E39 70Ah, at my VW dealer. I have checked the information with obdeleven and I see that the brand code is VAO, 70Ah, serial number 222222. But the batterytype is 'vlies' (second option).Is this right? Because there is also a option with AGM - binair.
Do someone have some information about this?
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Post by Deleted on Jan 31, 2018 20:14:37 GMT
One of the Golf Guru's can confirm but what I have from the Leon site is as follows
There are two types of battery used on VAG cars.
Enhanced Flooded (EFB) are essentially standard batteries manufactured to much higher standards. They have twice the endurance of standard liquid filled batteries and are fitted to vehicles with Stop/Start.
Absorbent Glass Mat (AGM) batteries have three times the endurance of standard batteries and are fitted to higher specification cars with higher electrical loads. In these batteries the liquid is absorbed by a framework of glass mats.
You can use an AGM battery instead of an EFB one, but at much higher cost.
These modern batteries required different charging cycles from standard batteries. If you buy a decent battery charger you will have options to charge a standard battery or a smart battery.
This is the reason why the car's battery management system needs to know what kind of battery you have. If you change a battery for one with an identical specification from a different manufacturer you may not see any error codes and it may charge correctly.. If you change to a different battery without recoding, it may not charge correctly, even if you don't see fault codes, and that may affect battery life.
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Post by dv52 (Australia) on Feb 1, 2018 3:45:28 GMT
^^^ Ron - I agree totally with what you have written, but I suspect that it's a bit more complex in modern vehicles where EFB/AGM technology are used and especially in cars that use a battery monitor control module (j367) which is connected to the Gateway module as a LIN device (what OBD11 calls a "sub-system"). Those cars that have J367 installed are clearly identifiable because the module is obvious: it sits on the negative battery clamp. All mk7s with Start Stop have J367 installed. So - in these cars, the complete history of the battery is recorded (every ampere flowing into and out-of the battery is stored) and the database is used to determine the charging profile of the battery. As the battery ages, the charging profile is altered to optimize the capacity (which decreases with the life cycle of the battery). If the battery type is kept the same, the important changes (IMO) is the serial number and the battery capacity. But the actual serial number doesn't appear to be important because most folk will notice when they access the adaptation channel that the factory setting will be hexFF (or, Binary 11111111). This appears to be the factory setting regardless of the actual battery serial number that is entered when the car is new. This tends to suggest that the actual serial number is not important. The only thing that is important when the battery is changed is that the factory setting hexFF is changed to another value (hexFE, say). What I suspect happens when this number is altered is that the history table of the old battery is reset so that the charging regime recognizes a new battery. If the serial number isn't altered - the old history table is maintained and the new battery will never be charged to full capacity. But the serial number doesn't need to be accurate and many batteries that are not BEM type will not have a valid number. Don
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