You can install our site as a web app on your iOS device by utilizing the Add to Home Screen feature in Safari. Please see this thread for more details on this.
Note: This feature may not be available in some browsers.
I can confirm the 82 kWh battery (BT42) in my 3/21 build Model Y Long Range, vin 144xxx. This information is straight out of the Toolbox software used by service techs.
