So, I disabled InstantGo/Conected Standby on my dell tablet, and the battery now runs for days. I charge it once a week or so, unless I start playing games on it (in which case the battery only lasts for something like ~3/4 hours). That device gets pretty heavy use for book reading/ netflix/ web surfing.
The downside is that the power button is stupidly placed next to the volume buttons. So I frequently hit it instead of the volume button and that results in a ~5-10 second hibernate/resume sequence. I've been considering how hard it would be to physically cut the lead to it and the useless "window button" and PtP solder the windows button as the power button. (I haven't found any software solutions for reversing them).