Why is my phone not charging properly?

The phone is at 2% when i plug it in,it says charging an hour later it still says charging and is very cold. Then an hour later it says 1% then drops to 0% and i have'nt use it at all. Then when it shuts off it says charging at 3% then it goes to 4% then drops all the way back to 2% and does'nt turn on. What is the problem?

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