OK, I now think I know what the problem is. And it's all Sprint's fault.
I noticed that after a recent power blackout in my neighborhood last week, EVDO has been down. I think a local tower got knocked out or it's coincidence and Sprint took one down for whatever reason. The weird part is that I have an Airave, and it seems my Phone is struggling to try to get a far away EVDO signal. That's just a theory.
For a control test, I charged up my old Vogue 6900 Touch (not activated). And left it in standby idling. I periodically checked the battery whenever I checked my Touch Pro's battery.
Get this. They were losing power at nearly the same rate. Whatever happened has something to do with local cell phone reception. Either my Airave or the local towers.
I have been at home a lot this week, so I haven't had the chance to spend extended time away to see if my battery life would be better elsewhere.
But at least I know it's not specifically my Touch Pro that is defective. Well, in theory at least.
-Ed