For TV-based players, that could be an issue. You'll need to buy a separate Joy-Con Charging Grip for $30, or be diligent about docking the tiny controllers in between sessions. If you forget from time to time, it shouldn't be a problem -- Nintendo is promising 20 hours on a single charge -- but it's worth keeping in mind so that you don't have to cut short an important Breath of the Wild session. Alternative solutions include buying a Pro controller or some extra Joy-Cons. I'll be doing the latter so I can host some Splatoon 2 and Mario Kart 8 tournaments anyway.