Battery Life Calculation???

[skimask]

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

As far as I can tell, probably not the full 137 days, probably not even 3 months. Surge currents kill coin cells. My experience says you might get a couple months at most. Maybe my coin cells were old, maybe my calculations weren't corrent. Who knows. These types of things are crap shoots, you never know until you try it...so...

Try it out and get back to me in April

[manumenzella]

Hey. Thanks for all your help.
I dont have any experience with this tiny lithium con cells, so i hink that you must be right!
Anyway, this project is supposed to beep in the classes of a teacher (she is really rude, and everybody hates her!!!) I ehink I saw another post on a similar project, but i cant seem to fin it. If you know the addres, can you post it please???
Thanks again, and sorry for my english!!!
Manuel