Michael - thanks for the reply - I have been hoping not to use the brown out feature - after checking the spec sheets it seems that it should also be called a "Current Hog" enable - drawing some 400 uA in sleep mode when enabled :) At 09:55 PM 6/1/98 -0500, you wrote: >If you are using a PIC with the brownout detection enabled, you shouldn't >have any problems, the PIC resets when the voltage level is below 4 volts. >Therefore, the PIC would be in reset until the second battery is installed >and a voltage greater than 4 volts is acheived. >