This is an awesome tip and reminder. Thanks.
One of the most annoying features of the LR3/LR4 for me is the lack of any usable DC power when the truck is turned off. You can't even trickle charge a cell phone like you can in virtually every other car.
That said, something about the rover electronics design has it chewing up a lot of power any time Accessory is turned on. So, even with it turned off (does this mod work with nothing turned on in the rover?) I still get a Low Battery warning way to soon in this truck.
Its pretty much the only reason I have ever wanted to do the 2nd battery mod... but man that seems like a lot of work just to be able to charge a phone. And you still wouldn't be able to run the car stereo for long when tailgating, which is another missed feature.