Iphone 5 not charging/ Fake charging

i Bought an Iphone 5 which is not charging. It shows normally that it is charging but the battery does not increase. so it is like a fake charging. The battery is not the problem i changed it and still the same thing.

Could it just be the Charging dock flex or is it something else?

Thank you !

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Iphone 5 not charging/ Fake charging