At least a minimum of 5-7 hours out of the box.After this initial and absolute full charge, unplug it and have your way with it! Drain that battery until you "force it to shut down" (save your work upon the low battery alert). Then proceed to charge it up again to 100% (this time just charge it to "full"). Go ahead and repeat the drain to zero. After 3 full charge and discharge cycles, your battery is ready for the road.