Hey. Thanks for your answer. I have just checked the Energizer datasheet for the con cell CR2032. It is rated at 240 mAh, and with a pulsed drain (2 seconds, 12 times/day, 6.8 mAh), it should give about 225 mAh.
Thats very little difference for such a big current (for a coin cell, I mean).
I think I would perhaps not be able to get the full 137 days, but perhaps about 3 months??? Please correct me if im wrong!!! Thanks again.
Manuel