I'd estimate the battery life at approximately 30 hours, though depending on how often you work out and If GPS is employed, battery life could drop to around 20 hours. (news.softpedia.com)
Additionally, estimated battery life remaining will be displayed in hours and minutes under the battery settings. (android.gadgethacks.com)
The Yoga tablet is powered by dual batteries, similar in power to those used in laptops, and the company estimates battery life to be around 18 hours in reading mode. (techpp.com)