and extended warranty is worth it if u not planning to buy a new mobile for next year or 2...coz u will definitely have screen burn ins in next few months...n u can get it replaced for free if u in warranty.
if not then the display change with battery kit costs 17-18k...my display broke soo had to get it replaced by paying since physical damage is not covered in warranty
if it's still in warranty then u can go to the service center n say that u have serious battery drain issue and also screen burn ins and image ghosting...I had that n they replaced the display n battery for free...