Hi, I am working on optimizing the battery usage I did couple of experiments and found some results. I am using Green LED, ADC to read battery voltage and timer to wake up from sleep. In the experiment I sent some random temperature and humidity data along with battery data in interval of 15 minutes for about 12 hours.
I am using semaphores to implement sleep and I am keeping the LED in Off when not in use. It will turn on when it wakes up from sleep and then goes off immediately.
Initially when I noted down the battery voltage it was about 4.14V and after 12 hour it was 4.10V. So there is a difference of 0.04V in 12 hour means 0.08 in 24 Hour. Since the minimum voltage is 2.75V for Li-ion battery it may take hardly 18 days to drain the battery to this minimum.
Maximum battery voltage = 4.2V
Minimum battery voltage = 2.75V
Voltage drop in 1 day = 0.08V
So, 0.08 x 18 = 1.44V
and 4.2 - 2.75 = 1.45V
Is this correct?