I am using a Bottled DAC and Bottlebat - absolutely love the sound. I also am using a Regen going into the DAC - I was told by Uptone that John used the Bottlehead DAC when designing the Regen and they do seem to work excellently together. Doing some research the other day on the net and I ran across a comment by John that one of the thingies in the Regen sounded best after running for at least 8 hours and reaching it's proper temperature. I am thinking the same might apply to the DAC. So, do you think there is any harm on leaving the Bottlebat in the run while charging mode all the time, switching to play but don't charge when seriously listening?