...anybody know why the 'little green light' stays on? ??:The one on the bottom of the unit itself. When I mentioned that, Davis quickly reached for the grease fix.
Quoting Page 4 and 5 of the book you presumably have:
"To verify power, wait 30 seconds
then push and release the white transmitter ID pushbutton next to the battery compartment.
The green transmitter ID LED next to the battery compartment will illuminate
when you press the pushbutton."
"When you release the pushbutton, the LED will blink once, then begin to flash
every 2.5 seconds to show transmission of a data packet. This flashing will stop
within a few minutes to conserve battery life."
Now, if the "little green light" stays on continuously, that means that the transmitter is transmitting all the time. And when the light is on, the light is taking power from the battery, too. That will cause the battery to run down rather quickly.
If (for example) electrical leakage across those exposed contacts signals the transmitter to be on all the time, then .....