So like i have in this VERY crude diagram? (really need to learn eagle so i can make some proper diagrams. )

So all the grounds should be connected? Would it work to simply inject the 5V into the wire so that it is reaching both the Pi and the Wifi adapter in this case? That way i dont have to worry about grounds? Also my charger outputs 1A this isnt going to be a problem since a device only takes as much ...

I just got my pi in the mail!!!! I have a couple project i would like to do, and a couple of them involve powering my Pi using a battery, and i happen to have a USB battery pack so its perfect. But some of the things i would like to do need a powered USB hub. So obviously this causes a problem. BUTT...