gdbjr, I hear you man. My battery use just feels so inconsistent, across both of the One X units that I have tried. Some days it works great, some days it is absolutely atrocious.
This is really frustrating, battery life is one of the most important factors for a mobile device. It doesn't have to be superb, but it has to be relatively consistent, so you know when to recharge, etc.
I am really considering returning the phone and just going back to my iPhone 3GS, to wait for iOS6 and iPhone 5. I love the flexibility of Android, but these battery issues are a dealbreaker, and I hear that this occurs on other Android-running hardware as well with "rogue processes" draining down the battery.
I have switched back to my S2, which is the best android phone I have ever used. I wanna say it is even better then my iPhone 4s. I haven't decided if I am going to try to get another One X or wait to see if I can trade it for a S3 next week. If I try another HOX, I will make sure it is one of the HT25 models as they have identified issues with the HT23 (I have) and the HT24. Desicisons, decisions....