Hi, I am making an outdoor weather station, with solar panel to charge two batteries in series (3.7v , 1600mAh) for each one, I have measured the capacity using a zb2l3 model.
By the way the most important is how to calculate the real run time, because as I know:
Runtime = Capacity/currentOfTheLoad= 1600mAh/12mA =133hours.
But the 18650 batteries use just the voltage between 4.2v to 3v is about 30% of the full voltage, so does we need consider just 30% of the capacity to calculate run time?Runtime=1600*30%/12=40hours.
And also for charging time , the current of charging is 70mAh , does i need just consider 30% of 1600mAh , and also which Efficiency Loss i need to choose below in the image?