Can a battery be replaced in an Iphone 4?

My battery is having to be charged all the time now with very little use. Can I have the battery replaced, and if so where would I go to have it done. Is it expensive?

Yes you can have it replace apple can do it, you can also look for stores that repair phone and you can also do it yourself check on YouTube on how to do it if you feel comfortable then buy the battery online.

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