Oh, right, I've just seen the video, I had to download it to get it to play.
That... urgh... Nuprol battery and the polarity
should be OK, although NiMh is old technology and I wouldn't spend one penny more on it. A 7.4V lipo will do the same job.
The basic-bitch mosfet in the Edge can get stroppy at higher voltages and motor draws, but would flash red if so. As
@Dan Robinson says, it should flash green when you plug the battery in.
If the mosfet isn't flashing green it's misbehaving (or conceivably the batteries are total duds, or your charger has
discharged them - some NiMh "smart" chargers can be worse than useless, and Nuprul gonna Nuprol).
If you're getting the green flash on connection, then the motor terminal connections are a good shout. It looks like you have the quick-access grip with a squeeze-to-open latch (that's actually a terrible idea normally, but which will be handy here). Be careful when you remove the base plate, there's a little disk in there which sits under the motor that loves to fall out and get lost.
Although since this is brand new, I would also agree that the best thing to do is to call the retailer and have them talk you through it, because at least then you'll be doing things under their instruction and they'll be less able to argue the toss on it if it does have to go back.
It probably
is something simple, that's not a fire-control mosfet, just a simple relay, and there's not much to go wrong there.
