The 44 Watt-Hour battery is slightly larger than a US dollar bill and can easily be removed from the bottom of the laptop. There is no option for a secondary battery.
The keyboard and handrest have a solid feel to them. There is very little flex to the keyboard. Your typical laptop function keys are along the top. One interesting feature is that the screen can be dimmed to completely dark.
The adapter is smaller than a dollar bill and weighs .85 pounds. It uses a three pronged plug (two prongs plus the ground).