WiFi drains battery even if it's off On my Nexus 5, since Android updated to marshmallow, the Wi-Fi is draining the battery way too fast, even when disabled. See the screenshot:
(Click image to enlarge)

I've seen this question: Battery drain when wifi is off but since I've a very stable network, the answer doesn't fit my need.
I've disabled the Location, I doubt that the issue could come from here.
Where should I look next?
Edit:
The real question is in fact &quot;How come that the WiFi usage bar is going from 100% until now even if Wi-Fi is Off?&quot;
Okay, to address the points here:

Marshmallow doesn't have the option of Scanning Always Available as it was in Lollipop.

So, what to do?

Marshmallow still has these options, only now they are fragmented and redistributed. It is now under:


Settings &rarr; Google &rarr; Services &rarr; Location &rarr; 3-dot menu &rarr; Scanning &rarr; Wi-Fi scanning


Also, there are:


Settings &rarr; Wi-Fi &rarr; 3-dot menu &rarr; Advanced &rarr; Keep Wi-Fi on during sleep


and


Settings &rarr; Wi-Fi &rarr; 3-dot menu &rarr; Advanced &rarr; Network notification,


if you are paranoid about battery.