This set of traces were compiled from January 2007 - present. The traces contains battery
usage data for 60 laptops. The number of days of data collected for different laptops vary since
the tool was installed on a rolling basis. Moreover, some users may have also uninstalled the tool
in the middle of using it. Apart from battery-usage data the traces also contain
data on CPU utilization, disk space, and idle time for the laptop users. 
