2022 e-tron GT
What brand/model of battery tender are you using?
I got this one:
Buy Victron Energy Blue Smart IP65 12-Volt 15 amp Battery Charger (Bluetooth): Battery Chargers - Amazon.com ✓ FREE DELIVERY possible on eligible purchaseswww.amazon.com
It comes with the cables to connect to the battery, like the instructions above. I like that the charger communicated with my smartphone via bluetooth so that I can see the status of the process. I had a different charger that gave no indication what it was doing when it was charging.