Q: My iphone 5s battery is draing fast after 9.3.5 update,so pls help me

Hey Noushad PS,
 

I can understand how a battery dying quickly would be an issue.
 

Have you taken a look at the article About the battery usage on your iPhone, iPad, and iPod touch to see what is using the most power? This will help to figure out what is causing the battery drain.
 

Cheers.