The vehicle has a Borg & Warner 'chain drive' transfer box. Instead of using a mechanical diff lock, it uses a viscous coupled transfer box (not all that dissimilar from the Freelander) which automatically progressively locks up when it senses a large difference in speed between the axles. (As you would get in a wheelspin)
There are pros and cons of this system. In it's favour it does give you a full time traction control system, which will work on slippery roads without intervention.
Against it, the viscous coupling is not in all the time, so the vehicle needs to lose traction before it will start working. Also, as with the standard diff lock, if they don't get used for a long time they can sieze up... so it would be worth getting a wheel on some slippery stuff to make sure it's working.
As for the dual-battery... it's not standard but there is a dealer-option to have twin batteries fitted with a simple split-charge relay.
