I've been running my 16LC84 on 3 AAA batteries and would like to run
it off 2 Lithium "button" cells. Does anyone know how long a 16C84
will run for, using the lithium cells in the following cases:

        1) No external load - 16C84 running simple timing loops

        2) Port pin tweaks transistor base every 5 mins to drive
           a light inductive load  (3 volt, 120 mA motor)

        3) 16LC84 on single 3 volt lithium cell.

I'm not looking for an accurate figure, just an indicator as to how long
the batteries will last. i.e.  a few hours, a few days or a few weeks -
I'd be grateful for any info on this.

Geoff