HTC 3400i
Attery problem, phone hangs

Sir,

i had taken HTC 3400i on 5th jan from THE MOBILE STORE, DAVANGERE, KARNATAKA, IMEI NO 353533012170042, now i am having problem with if i charge in the morning i.e 100% by afternoon with out using only 50% charge will be present. and in between phone gets hanged wat to do can u tell nearest service/ care centre and r thet going to replace the battery bcz 1 year warranty is there na so... reply me soon