Phone is not charging properly

Take a look at this guide:--> If your iPhone, iPad, or iPod touch won't charge - Apple Support

If, following ALL the steps provided, you get no improvements, have your device inspected at an Apple Store or Authorized Service Provider. They have tools to deeply check everything and, in the and they'll give you the appropriate judgment:--> Apple – Location Selector

Regards

Giulio

What IPhone do you have, I have an IPhone 6, and I replaced the battery half a year ago and only now have the same problem.