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CC2640R2F: How to Calculate the Exact or Closer Battery Life of the Device?

Part Number: CC2640R2F
Other Parts Discussed in Thread: BT-POWER-CALC

Hello,

As of now, We are calculating approximate battery life by getting

CYCLE ON TIME (5 sec)  and its current consumption (24.2mAs) 

&

Sleep TIME (1795 sec) and its current consumption (0.0065mAs)

Then Calculate the total one cycle current consumption which is 37.2065mAs (approx.)

And One Day current consumption is 48*37.2065=1785.912. Then We will divide with Total Battery Capacity like if it is 1A (it is 1000mAh which is 3600000mAs). that is 3600000/1785.912. We will get 2015 Days (approx.)

Is Above method is right? or What is the exact procedure to find based on the device family, clock speed like that? [My device is CC2640R2] 

And I Saw some other websites for reference, please look into it that whether that method is okay.

1.  

2. https://oregonembedded.com/batterycalc.htm

3. http://www.of-things.de/battery-life-calculator.php

Kindly anyone Help  me to find out the correct way for that. And I saw excel sheet shared by one TI employee in another thread to calculate the battery life. Somewhat it was not able to see. 

Thanks in advance