Hi kadiriibrahimd,
If your smartphone is not charging properly anymore is due to the fact that the battery is thouroughly exausted of being charged whole the time. If you keep your smartphone charging while the battery is already fully charged it will have a negative influence on the battery life. This is usually the cause of a faulty battery. I suggest you buy another battery (2 or 3 ) and advisable would be a charge capacity of 4000 mAh.
Hope this might help