It can be frustrating at times when an important update has arrived but you can't install it because you are just below the minimum battery percentage to update. IF your confident your surface wont drain out before the update is finished then: Go to charms, settings, power, and hit restart and update. Your surface will install what ever update you downloaded regardless of the amount of battery you have left. Works for me
BTW I take no responsibility for any bricked surfaces!
BTW I take no responsibility for any bricked surfaces!