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I took my x50v with me to a conference last month (running wm2k3-se). I found that if I kept the backlight at minimum, and only turned on wi-fi at the hourly breaks to check mail and news, I finished each day (9 hours) with 15-20% battery remaining. I have the basic 1100mAh battery. I used the notes app to jot down items throughout each session. Bluetooth seems to be the bigggest drainer, followed by wi-fi. Keep them off when you don't need them and you will see a big difference. Also, if you are in an area with plenty of light, you can quickly turn off the back-light by holding the power button.
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