I left my DR for 4 days, it was around 75% charged and it was flat as the proverbial pancake when I came back. There are still a few issues to reslove I think. Checking the lights after a shutdown was a good trick in previous versions as it didn't always shut down correctly. In V1.6 though, I still check the buttons and Lights, but that now appears okay.
So, as I stated above, for it to go flat in 4 days with no use suggests some other mechanism. It was in its cover and there were no Flourescent lights on
Howard