This has to be one of the worst design decisions ever. 08 RS60 - Dead battery can't pop trunk. Easy enough to wire up to the fuse box, but that didn't do it either. Bought a Black-and-Decker lighter-to-lighter charger at 1050pm local Target, and it opened right up.
Seriously though - did some German decide to play a cruel joke on the world by putting a battery-powered trunk switch on a trunk that closes on the battery?
For a company in 2008 that couldn't find a way to put an Aux input on the damn stereo, I'm shocked they went to the trouble to do an electronic hood switch!!!!
Thankfully the car drives like a dream...