the recent wm5 horror stories & personal experience made me searched the net for some reviews by various people regarding the x51v & wm5. in particular i was look @ the info about battery life. i found that batt life in x51v with 1100mAh batt, according to some reviewers, ranged from 3h+ to 13h+ (various different processor speeds, wifi/bt, screen on/off/brightness etc)
My personal experience with my x50v on wm5 is horrible & with dimmest light, wifi/bt on & speed @ auto I got no more than 1h30mins.

I don't have a x51v for comparison, & i m sure x50v on wm2k3se at the above mentioned setting lasted approx 2h.
for interest sake, would anyone like to share the battery lives that they experienced with wm5? if we all made our settings to wifi/bt on with no powersave features, screen max brightness, max cpu speed, i m sure it won't take >2h of your time.
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update:
x50v, wm5:
wifi/BT on, max brightness, 624mHz, 1100mAh, running wa2: 1h15min
x50v, wm2k3se:
wifi/BT on, max brightness, 624mHz, 1100mAh: 1h:20min
x50v, wm5:
screen off, cpu @ auto, 110mAh, tcpmp playing mp3s non-stop: 5h:30min