The keyboard is not getting charged when closed and attached onto the LCD screen.
It may appear as if the keyboard is not getting charged when closed and attached onto the LCD screen. Actually the keyboard does charge, regardless of whether the keyboard is turned On or Off. The problem is that when the keyboard is in the On or Disable touch pad while charging, it drains almost as much power as it is receiving, and thus not show much charge to the battery.
For best possible charging results, make sure the keyboard power switch is in the OFF position.