I have to buy a mobile phone between 10-20 K. My primary requirement is an excellent camera and decent battery life. Any suggestions?

Hey Buddy...!!

I would suggest buying asus zenfone 2.

It has excellent camera.

One of my friend  has bought it recently, excellent camera+candy-cam generally makes our day for selfies.

Also the battery life is good for this phone.

Asus Zenfone 2 ZE551ML (32GB)  for RS 19,799/-

&

Asus Zenfone 2 ZE551ML (Silver, 16GB) for RS 13,999/-

One thing that annoyed me with this phone was it's volume button which is placed at the backside of the phone. It troubles while taking screenshot.