My its not charging properly...why?

Things to check:

1. Are you using the original fast charger? “normal” chargers can take over a day to charge the battery in this phone. If yes, see if it charges another device.
2. It is possible your charging cable has broken, so try charging another phone with your cable. Also maybe try another USB cable on your charger.
3. If it still will not charge, maybe the charge port broke in the phone (you can purchase a new charge board on ebay under $10US). This is common if you had to hold the cable a special way to allow it to charge before, which is a sign that the connector has started breaking internally, and a new charge board will be needed soon.
4. Also it is possible the battery just died. Dead batteries will not charge. The phone will require at least 4% battery charge to even try booting up.

If you see the phone react when plugging in the cable, this indicates that the phone is trying to charge. Usually it would show a charging battery logo when pushing the power button for about 5 seconds. If you can see this logo, then it’s receiving power and trying to charge. If it stays like this all day without filling up the battery, you probably need to install a new battery. If you never see it react to plugging in the cable, your problem is most likely the charger, brick, or charge port. Use another device to test the charger and cable. If the charger and cable work on another device and still doesn’t have your phone react, then you should look into replacing the charging port board on the phone.