I tested it without letting the device power off. "Cell standby" sucks down about 5% of the overall battery daily according to Android battery statistics, and I suspect they understate the drain. With just that change, battery life gets cut in half for me.
With some searching, this is apparently a common onyx problem, present on other devices. They left in place phone related apks, and even with airplane mode enabled, these apks attempt to find signals on cell radios that don't exist running down the battery 24/7. This is what bulek was speaking of in post #8. I'm disinclined to root while I'm under warranty, so I'll probably just stick with the power down option for now.
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Originally Posted by Hrafn
Either the AG2 idles very efficiently, or it sleeps very inefficiently, and I'd tend to suspect the latter.
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I now know it sleeps VERY inefficiently. Onyx is guilty of high(ly unnecessary) crimes against battery life.
