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Hello, I'm Brandon - VW tech.
Yes, this is true. You will need to register the battery at the dealer.
The dealer will plug in their computer and the vehicle's computer that you have changed a brand new battery.
Most of the German vehicle are like that now.
This is one way how the manufacture wants you to stay with them.
Please don't forget to rate me positive for the prompt service. Thank you!.
Thank you for your support .
Technically you don't have to. The car will still run ok without registering.
Register the battery so You won't get a battery check light in the future.
Registering has nothing to do with the performance of the car.
If you disconnect the battery the car will stall.