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How to resolve HTC Evo battery issue?

Hey guys!! I did not know I would turn out be fool after buying HTC Evo mobile phone. After spending so much money on the phone, I got stuck with its battery as it cannot even work for half a day. What should I do to resolve the issues in HTC Evo battery? I have a warranty period so will I have to pay or will it be free of cost? Please help? Thanks a ton