Camera mic preamps are generally garbage. I wouldn't rely on using just the camera to record audio - Run the recorder line out to the camera input on line-in and you're good.
Also, the camera won't give the mics the voltage they need to run without brickwalling.
Definitely I would be using the battery box with the mics and pocket camera.
I know that in general the preamps in cameras are not that great but couldn't find any real world experiences online. Not even any comparisons between the Panasonic ZS100/200 and the RXV100VI/VII with just their internal mics.
My balls must be soft because the last 2 nights I was too afraid to bring a recorder in a clear bag but after the experience, I think I would've been ok. I did great at video, but the audio is so bad
(Waiting for my mics and battery box to come in to use with my new recorder that I believe would be less problematic that my older recorder.)
So 2 nights ago I recorded with:
ZS100 internal mic (this one has no mic input)
My gf Samsung 10+ internal mic
10+ with an Sennheiser XS Lav
ZS100 distorted the least, so I used that
Cell phone's internal sounded the best but distorted (strange, because other shows ,where it was much louder, it didn't distort as much)
XS distorted the most (kinda surprised) so that is being returned. I only got that as a backup and possibly for v-logging but not worth the $50
Some shows are general admin so we show up early to get in line to get the best view. My gf can't always see the band if all the good spots are taken. So in case I need to go back to the car, I'd rather take with me what I know will not be a problem...until my balls harden up. So that's why I asked.