Yeah I just checked on the slim, if the battery in I get a voltage reading as long as the battery is in, I have no idea if this is different for phat. I would just add a simple 3 pin slide to it.
Hey sorry for a BIT off topic, but I checked on the slim with a multi meter on those gold pads, with the + stick from the analog multi-meter to the positive 5v and the -to the gold pads, I got a reading of about 5.2 volts. But then I just touched the - to lots of other random resistors etc and still got a reading so I'm confused...