I have a circuit which is powered with 8x 1.2v/2700mAh akkus. So I have 21600mAh.
My circuit draws about 1mA when it sleeps and about 200mA when it runs. I want it to run 100 days without recharging, so I have 216mAh per day. That means 1 hour of 216mA or 24hours of 9mA.
So I can use 9mA per hour, which means that my circuit is allowed to run 4% of an hour. (200*0.04+1*0.96 = 8.96) 4% are 2.4 minutes.
Is all of that correct?