L322 Fan heaters on without key, smoke from battery area?

Hello, my parents 07 Range Rover Vogue Diesel auto developed a fault yesterday and I wondered if anyone has experienced this or can suggest anything. When trying to start it yesterday it started then stalled, wouldn't restart, but when the key was removed the heating fans were on? The battery was disconnected at some point to stop the fans and then some smoke came from behind the battery? The rac popped out and couldn't help, the car is now dead, no dash lights, nothing. Any suggestions welcome, we have it booked in at a LR specialist at the end of the month if we are unable to fix it.
Thank you!

I red some where you have to wait 20 minutes after disconnecting the negative be four disconnecting the positive or the explosive charge on the battery con go off ....

If the temperature was below around 6 degrees it could have been the FBH (aux heater) kicking in. The FBH is located below the battery and can be disabled by pulling fuse 59 in the glove box.
Have you tried to charge the battery ?

Thank you, I'll pop over there tmrw and charge the battery and remove that fuse. Would the FBH be the cause of some smoke that was seen around the battery area? Thanks again

Swell1 said:

Thank you, I'll pop over there tmrw and charge the battery and remove that fuse. Would the FBH be the cause of some smoke that was seen around the battery area? Thanks again

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It's one possibility. A properly functioning one shouldn't smoke but if it's not burning the fuel cleanly then maybe.