Adding Power To The Wireless Camera

Hey All, A couple of questions:

1. when you wire up the camera to the EZB power sorce, do you also have to remove the camera battery?

2. I watched DJ's instructional vid and couldn't work out where he soldered the white wire to the boaard. I havn't soldered mine on and it still works OK - do you have to?

As always, thanks for your help.