Now that I think about it for a bit, I did see some anomalies wrt power levels.
About two days ago I turned it off in Android. The next day, when I powered up, it did read a drop in charge in Digital. It read 79%. When I rebooted it to Mango OS the Digital read 87% - which, iirc, is what it should have read - assuming no actual charge drop.
Maybe it's a "reporting" error others are experiencing? And not an actual discharge?
I just tried a reboot from Android to Mango OS and they both were the same D/A levels....