I had a really unpleasant experience with the MixPre 6 II. I returned the first unit because battery runtime was with the correct batteries around 10 minutes. No chance without v-mount or large powerbank. The second unit I received failed during an Interview because of a real time clock Error - "please contact Sound Devices Support". Unit couldn't be repared so I got a refund and bought the Zoom F6. It works flawlessly. Just a Personal experience, but I think it is worth mentioning.