I updated the firmware yesterday, and after using barely 3 hours in battery saver mode first at 50 percent of brightness then reduced to 35 percent, I came down to 53 percent to battery life just by using the Sketchable App. Before I used to get a better battery life. I even had once my computer crash when I reattached, which never happened before. I hope that the new firmware update didn't mess something in my system..