The battery life in this device is a big question mark.
Will this processor enter the already well known for TabletKiosk eo v7110 users "C3 State"? I hope so. If this Pentium M is not configured to enter in this state we can expect a battery life less than 2 hours, and I would say a lot less than that.
I'm hoping to get one of these units to review and see in what level in right in my above comments. Until that moment, and keeping in mind that this User Manual was issued back in 2005, all we can do now is to speculate.