Battery drain issue in phone calls 2G/3G/4G.

First of all sorry for post images in portuguese.

I have a big issue with my mi4c 3GB 32GB, my battery drains much more in simple 2G/3G/4G phone calls with screen off then in web browsing with the screen on or using my mi4c.

Example
Phone calls 1:00h = 40% battery drain
Screen on Time 2:00h = 20% battery drain

I have a friend with a mi4c too and the issue is exactly the same.

See screens attached is incridible.
I allready flash cyanogenmod 13 and is the same issue, anybody can help me?

I am searching for fix this issue a long time ago.

THANKS.

Attached Thumbnails

     

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