Hi Garry,
I am sure an expert will be along to further clarify this, this quote is from LR during the release of the RRS in 2006:

"An automatic protection sequence takes place in the event of a crash. This includes instant shut-down of the engine and fuel system and operation of the hazard warning system to warn other road users. All the interior lights are activated and all doors are automatically unlocked."

Just went out and had a look at mine and the battery terminal is connected to a moulded box about 5 cm by 5 cm by 1 cm with the lead to the starter out of one side and the lead to the main fuse box bus out the other. A low current wire also is attached which I presume is the trigger wire for the pyrotechnic device.
Clearly as the hazard warning operates all power is not cut.
There is no way that the battery connector looks anything like a standard terminal.
Interesting to find out what actually happens.
Regards,
Barry 2017 Range Rover Sport TDV6 L494 SE Fuji White
2011 Range Rover Sport SDV6 L320 SE Fuji White Loved but GONE
2010 TRAKKA Motorhome Fiat Ducato GONE (What a dud, don't buy one)
2006 Discovery 3 SE TDV6 Automatic Chawton White/Ebony. Loved but GONE
2006 BMW X5 diesel White/Charcoal, Bought new, Gone after 12 years! Was Excellent.
Ex Member Range Rover Club NSW