Posted for "JIM HANKINS" <jghankins@msn.com>:

Bill,    I had the same problem with a KLX135.  The battery is available from Radio Shack (but not in their catalogue) for about $10.  Open up the unit and solder only 3 pins on the board. Be careful and save $190 and a trip.  It is in an experimental airplane

Jim Hankins