Just wondering what kind of experience people have had with battery packs rather than batteries. I have had my game gear for a while but Ive always just used a AC or car adapter since i never really had a place to take it where it would be worth using batteries (besides a couple plane rides that set me back a few bucks on batteries). Is there an advantage to the official one? i was also looking into the one at lik-sang ( here ) since my last cigarrette adapter died too. anyone know how good this one is? thanks for any input.