Josephiah,
Maybe the 9V battery cannot drive up the LCD back light.
Actually, we have redesign the Stalker, replace the Level Shifter IC to a Dual-N-MOS(AN97055:http://ics.nxp.com/support/documents/interface/pdf/an97055.pdf);
As Chinese new year vacation, our Product Engineer is not back, yet. Please wait a while.
Thanks
Albert