You can download map areas in Google maps in advance, and Google maps will work offline in Android Auto: https://support.google.com/maps/answer/6291838?co=GENIE.Platform%3DAndroid&hl=en
Yes, it's not specifically listed in the table of contents. It's in the "Battery - North America" heading.
The high voltage battery (nominal 400V) is also called the "traction" battery, which is what powers the electric motor to drive the car. There is also a traditional 12V battery to power...
It's on page 243 of the owner's manual:
"Vehicle Storage
Four Weeks to 12 Months
* Discharge the high voltage battery until two or three bars remain on the battery range indicator (Battery symbol) on the instrument cluster.
* Do not plug in the charge cord.
* Remove the black negative (−) cable...