If you want a portable TV that you're certain everyone will be able to see, try the KTC MegPad, available on Amazon for $899.99. This Android-powered, 32-inch smart TV is attached to its moving ...

How much lower varies, but typically about 20% dimmer than when plugged in. A few of our picks are small, and therefore "portable," but have to be plugged into an outlet or other power source to work.