Having been unboxed on video, the Willcom D4 UMPC has now travelled over to Jenn at Pocketables for some darned good testing. While the system is still something of a miniturization marvel, the first reports aren't exactly glowing. Top of the list (or should that be bottom?) is battery life; Willcom themselves only promise 1.5hrs and that measly figure looks sadly accurate. Worse still, Jenn found that leaving the D4 in Vista's sleep mode for 7hrs drained it to just 19-percent: around 15 minutes of actual use.