HTC India — Battery problem

Address:	Bangalore, Karnataka, 560004
Website:	Htc handset

Battery back up is nt coming it will get dry soon so i gave for htc customer service once but problem didn't sloved so i went again for customer care service but bull they said no problem with ur phone may be u playing games so it's happening lke that but i didn't installed single game in this case battery is drying very soon if phone goes around 20% to 15% hardly 5 mins it i'll come then it i'll switch off please resolve this issue soon