So it's been happening for awhile- but the battery on my iphone is terrible. It will not hold a charge for more than 1.5-2 hours tops. It constantly has to be plugged in so I carry a charger with me everywhere I go. It is so inconvenient. Do I go to my phone service store for this, or the apple store? Do I have any type of warranty or something that will cover the cost of getting it fixed if I bought the phone (brand new through sprint) two years ago nearly exactly?