Haven't seen much discussion of the "powercfg /batteryreport" command in this forum, which actually gives slightly different information that the "powercfg /sleepstudy" command. Check out the attached screenshot. The batteryreport command will analyze your past usage and spent out some data giving you estimate full-charge battery life based on your usage. For me, looks like I can expect about 7:30 of active usage on a full charge. That's mostly browsing, email, PDF annotation, and Metro apps (like tapatalk) at 35-40% brightness. On an i5/4GB. Would be curious what stats others are seeing. Apologies if this is a repost.