IAI America XSEL-QX - Manual (Page 120)

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Part 1 Installation
Battery Replacement Procedure
[1] Remove the 7 segment LED panel from the
controller. Slide the panel upward and pull it
toward you to remove.
[2] Press the center of the battery using a finger, as
shown. The battery will come off from the holder.
[3] Install a new battery into the holder. Pay attention
to the polarities (the + mark should be facing you).
[4] Install the panel in the original position.