I used it off and on from around 1:00 PM after a full charge. At midnight it was still at 85% - hadn't done anything heavy but had tried a lot of things, downloaded a bunch of apps, and played with (and then reset) the power settings. My impression is that it will easily last more than a day with light to moderate use; certainly a day of heavier use; and quite a bit longer if you are some place with no wifi and switch to airplane mode. In a couple quick tests of streaming video and music, it was also a bit better than my former Transformer Prime and a bit worse that my former BlackBerry PlayBook. Altogether, my impression is the battery life rating is reasonably accurate.