Nexus 6p Crazy battery drain please help

This is cannot be a normal. I changed the official Nexus 6p rom to CM 13 trying to fix this issue .
I have a very good screen on time i get around 3-4 SOT but very bad standby time .
My question is what is media server. And why Gsam shows audio on 10+ hours. Is it normal?
My phone doesn't have any music files.
I few photos from the camera and whatsapp .
I don't have much apps installed .
I don't use any music services such as Google play music or Spotify .
I don't use any google now services or ok Google .

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