I've had my X1 a few days now (nearly sent it back, until I found SmartWatchM would get it working with my MBW-150 ). Battery life isn't much better or worse than my old P1i - a full day out of the office in London will run it flat, with Push email enabled.
However, on Saturday I had forgotten to charge up, and I ended up with a critical battery warning, followed by the X1 turning off. I couldn't get it to switch back on, even connecting to my car charger didn't work (I thought these phones should always work from external power?) When back home and hooked to a mains charger, it had to charge for nearly 30 mins before it would come back to life, and at first it came up with 4 coloured bars and various version numbers - which I think is the firmware upload mode.
Anyone else encountered this sort of behaviour on WinMo devices?