===================================
I don't need a lot of
accuracy, just a ballpark figure (say, tenths of a volt,
+/- 50 mV) to let the user know when to change the
battery.
==================================

I have a question.  At what voltage do you read from the 9v battery do you
determine that it should be changed?  I am building a device using some 9v
alkaline batteries and I am putting a low battery indicator circuit to light
an LED but not really sure at what point you should have it trip and light
the LED to tell the customer it's time to change the battery.
Thanks,
FJ

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