Oh, and if that's not enough battery life for your for some reason, you can snap a Moto Mod battery directly on its back to extend your browsing time even more. (androidauthority.com)
So, just make sure there is enough battery power left — more than 50 % should do; else plug in the charger. (android.gs)
As for the update process, just be prepared with enough battery and a WiFi connection, because it weighs about 1 GB. (androidauthority.com)