I have several Mobius dash cams. I like them a lot. I have not yet used one as a body cam. They sell long cables so you can mount the lens (camera?) separate from the rest of the unit. They can accept a 64GB MicroSD for a very long record time, but onboard battery is good for only about 60 min.
The newer versions battery lasts a little over 80 minutes I believe it is. There is a Mobius 2 coming out sometime, not sure the specs though. You could use a battery bank with extended USB cable to power it for longer. The mobius is a very good camera for many functions, great video quality and picks up audio well. I have one as a camera on a quadcopter and a car dashcam.
I'm curious about those who want body cams, are you trying to keep it somewhat hidden, or would you just clip it on to your shirt pocket or something of sorts? I completely agree walking around ready to record whatever. I've learned from experience to be ready and always record everything you can, you won't believe the situations I've been into by people I trust and other things. Your word is not good enough anymore, even in court, as if it ever has been I guess.