I have used the extended battery I showed on the video review all day today and am very impressed so far. This is not a scientific benchmark but I have been inking on the Fujitsu 1610 since 9 am this morning through 3 meetings and a Starbuck’s session and it’s now 3:30 pm. The extended battery is at 19% with 58 minutes showing of battery life left. Subtract out an hour of “between meeting” time and this is one impressive battery! EV-DO was running at least half of the time, too.