Wifi using power even if it off I am using Lenovo P2 having Android 7.0. It having 5100 mah battery. In the battery usage I noticed that the wifi using power even if it turns off. I did a factory reset. But still have the same problem. 

I have attached a screenshot after did the below procedures.
1) Turn off wifi
2) Fully charge the phone
3) Restart the phone just after unplug 
4) Use the phone more than one day without turn on the wifi. Only use the mobile data.
Configure as shown . These are for Marshmallow and may differ on your device 


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


(As confirmed by OP on Nougat Settings  → Location → Scanning → Wi-Fi scanning &rarr; Disable )


Settings → Wi-Fi → 3-dot menu → Advanced → Keep Wi-Fi on during sleep &rarr; Never
Settings → Wi-Fi → 3-dot menu → Advanced → Network notification &rarr; Disable


This should fix the problem in all likelihood