Battery Level discharge curve, How can I read?

[GunMin]

I found this website.

link text

curve is shown below.

There are app_utils.h information below.

• @brief Function for converting the input voltage (in milli volts) into percentage of 3.0 Volts.
• @details The calculation is based on a linearized version of the battery's discharge

•       curve. 3.0V returns 100% battery level. The limit for power failure is 2.1V and
  

•       is considered to be the lower boundary.
  

•       The discharge curve for CR2032 is non-linear. In this model it is split into
  

•       4 linear sections:
  

•       - Section 1: 3.0V - 2.9V = 100% - 42% (58% drop on 100 mV)
  

•       - Section 2: 2.9V - 2.74V = 42% - 18% (24% drop on 160 mV)
  

•       - Section 3: 2.74V - 2.44V = 18% - 6% (12% drop on 300 mV)
  

•       - Section 4: 2.44V - 2.1V = 6% - 0% (6% drop on 340 mV)
  

•       These numbers are by no means accurate. Temperature and
  

•       load in the actual application is not accounted for!
  

• @param[in] mvolts The voltage in mV
• @return Battery level in percent.

I don't understand the above graph look.

How can I split like a source in the app_utils.h?

What are criteria divides?

And can you analyze that graph?

If you analyze, what should I do?

Or is there another way?

Oh.. I use CR2032. I would like to know how to use, even if the other batteries ago.

[muhkuhns]

I am not quite sure what you want to do. Do you want to convert the measurement of your battery's voltage to a percentage of the usable capacity left? Something like:

3V = 100%, 2V = 0% and a function for in between?

The measurement is no problem. And the conversion neither. Is is never exact.. As the graphics you posted show it is dependent on discharge rate , temperature and so on. For most cases a simple linear function should be enough.