Please list Dell model number and version of windows. Ex: Dell Inspiron 3543, windows 10
In the meantime, please check status of AC adapter in the BIOS. If adapter isn't detected in BIOS, the system will continue to received power but will not charge the battery. Please follow steps below:
1. Power off system.
2. Power on system, quickly start tapping F2 key continuously. You should be in the BIOS. The status of adapter usually listed under the main screen.
The adapter should say the adapter type, if it says 'Unknown' or 'None', then it's a issue with the adapter, and most likely needs to replace with a Dell genuine adapter that suitable for the system. Note: Wiggle the adapter's end while checking it in the BIOS