PS Vita have around 4 to 5 hours , i am expecting switch to get the same battery life. I guess it will close to Vita rather then 3DS because Vita was a powerful handled when it was released. And also Nvidia Tegra tablet also has the same battery life. So i am fine if it's below 6 hours , hell even 4 hours battery life is more then enough. Combined with fast charging on USB type C. Then that device is good to go. Now i hope the machine does not get too hot on my palm like Nvidia tegra