Battery coding help

Hello,
I’m a complete newbie with VCDS and I need help.
Would the battery coding for my 2007 S6 be in 19 - CAN gateway or 61 - Battery Regulation ?
I asked many places, but half of ther people say 19, the other half 61…
If its in 19, my ‘Adaptation’ button is greyed out and I can’t click it. Some say I need to go in security access and log in and it will be avaiulable. Is that right?
Figured I shoudl’ve asked here from the beginning since its an S6 specific forum…
Thanks

As 2007 is a pre-facelift, it is in module 61

Neither the new or the old has a BEM sticker. Do I only need to change one number of the serial number and its fine?

It depends if the old battery was coded correctly, and if you now have the same size and type of battery, as you’ve had previously.