Just as a point of reference, I'm showing 16% phone idle and 14% cell standby.
I have no idea what phone idle and cell standby are. Seems like it's saying the same thing, doesn't it?
Anyway, I wouldn't feel right if I didn't share my philosophy on battery usage and Android phones. Don't worry about it. People try way to hard to analyze these things and it never does any good. The best thing you can do to bring you peace of mind is just to spend 8.00 or so on a spare battery on Amazon. I'm not sure what the price is for the X but I'll bet it's inexpensive. Then check out ebay for a wall charger.
For $25.00 the peace of mind is worth it.