My iPhone 5 dies extremely fast?

I have an iPhone 5 that I pretty much only use while it's connected to the charger it dies anywhere from 90-100% it barely goes lower than that before it dies. I can usually wait a couple minutes and turn it on again but then it dies even quicker than before. Anyone know the problem? Do I need to replace the battery or what? And how much does it cost to get a new battery? Thanks. Oh and it's blacklisted I don't know if that makes a difference

Iphones are designed to fail some point in time so you will have to buy a newer version.

Being that it's blacklisted i'd say you have a problem. Unless you know someone who could put the battery in for you. A battery online would be about twenty bucks for it and a repair kit.

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