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Although we have yet to take delivery on our new X (Feb 15th :D), I was reading through the NAV manual and I see that all addresses are lost when the car battery is disconnected. Why doesn't such a sophisticated system have a battery backup? Does anyone have any thoughts on this?
 

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I know some auto shops have some kind of a aux. battery hook-up they use when replacing old batteries so they don't have to re-set all of the radio stations. I've seen an adapter that plugs into the cigratte lighter to jump start a vehicle, I wonder if that could be used while swapping the batteries, just would hope that it wouldn't screw up any of the electrical systems.
 
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