I'm sure this will be here on the site already somewhere, but my searches didn't find it, so copying here. Much more detail on those battery error code lights than in the manual !
(Graphic courtesy of Drone DJ)
Yes - ditto in Canada here. And it's too bad since the new rules allow for sheltered operations BVLOS around buildings for inspections and for EVLOS up to 2 nm for mapping/surveying. 4G would be a really handy thing to have for these operations.
Well, it's not on the list, so I would contact DJI for clarification. Just use the chat function on their webpage - they've always been very forthcoming when I talked with them.