Yeah lol, if you're not impressed over a Dx1 you don't know what to look for.
Anyway, it is a glitch in the reading of the battery, it doesn't actually drop that much. It does the same thing on an extended battery, even 10% sometimes, but I get 24-36 hours from my extended, so no way am I dropping 10% in 1 minute.
I have noticed, after it reboots and shows the drop, it will drop slower after that, sometimes sticking at its current level for some time.
Hopefully we'll see a software update to fix it. If not. I really could care less since its not really using up my battery.
Sent from the hand of zeus!