How to put new batteries in your iPhone 4S?

For my birthday, my 24 year old daughter Rebecca bought me an iPhone 4S. It says that it has very low battery, and I can't figure out where to buy batteries for it! Also, I can't seem to find a place where the iPhone can open. Anybody know where to buy iPhone batteries?

You have to crack the seal first. Use just a few drops of water on the side in each corner of the phone after a bit the pegs will swell and the phone will spread open so you can access the battery. Apple was really tricky with this one. If it doesn't open just use a bit more water.

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