Sir my iphone 6s drop battery while not use guide me about that problem

Hello and welcome to Apple Support Communities, junaid295.

If we understand your post correctly, the battery of your iPhone seems to drain faster than expected. We’d like to help.

You can use the tips in this article to improve battery life:

Maximizing Battery Life and Lifespan

If you're still having this issue you can use the steps in this article to identify any app that is using more battery life than normal:

About the battery usage on your iPhone, iPad, and iPod touch

Let us know if that resolves this issue for you. 

Thanks for using the Apple Support Communities. Take care.