Perhaps someone can help me with this one -

I am considering using 2, 3V lithium batteries (coin cells) to power a
small PIC based device - the unit will be powered all the time and will be
in slep mode most of the time - coming out when a button is pressed to wake
it up on port B <7:4>.  The two cells will be placed in one of those
"double height" PC board holders.

My question is this - with the cells powering the PIC directly (i.e. no
regulator etc.), am I going to run into trouble with the thing when the
user replaces the cells as one will be placed in the holder first , then
the second.  I checked the holder and the clips do grab a single cell,
thereby presenting 3V to the micro for a period of time before the second
cell is inserted.  There won't be any brown out or watchdog.  Am I likely
to cause the micro to "fetch up" with this preactice?  Perhaps there is a
common "rule of thumb" that I am missing here - I haven't designed a device
like this before.

Thanks for any help peopl can provide.

Lewis
cobb@zeus.ee.unb.ca

PS - there are no other circuits to worry about for the most part in this
unit as all other circuitry is powered from the micro's port pins.