GE NX-10 Installer Manual page 150

Open the backlight battery compartment as described above.
6.
Unscrew two screws inside the backlight battery compartment as shown below.
7.
Open the operating battery compartment and replace all four batteries. You have 5
8.
minutes to finish this operation. You must use Duracell or Energizer "AA" batteries only.
After replacing batteries, you have to close the battery compartment in 30 seconds.
9.
If "Type # to finish" message is displayed, press the # key to restore normal keypad
10.