Poor battery when it comes to Phone Calls

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http://forums.androidcentral.com – I have only had this phone for 5 days now and not that much of a talker over the phone but I am completely baffled about the very low battery life on phone calls I was only on the phone for 20 some minutes and it dropped almost 20 percent. I thought this phone was supposed to have a 8 hour battery life of full talk time. With what I'm getting now I wouldn't be able to manage a 3 hour phone call without the phone dying. My old HTC Inspire 4g had excellent phone call battery life what happened to this one? it was still at 100 percent before making the phone call and when I looked at the batte (HowTos)