If the controller is being used as it’s charging, it will take longer to reach a full charge. When the controller is being charged, the light bar will blink orange slowly. When it’s finished charging, the light bar will turn off. You may have to resync the controller to your PS4.
If your light bar isn’t on, make sure the USB and micro-USB are inserted properly. If the problem persists, try a different charging cable. If your controller isn’t connecting, this could indicate a problem with the micro-USB port. You may need to clean your controller or repair the loose port.
If you use a charger higher than 5V, you might burn out your controller. Search the back or side of your charger to confirm it is 5V.
When it’s finished charging, you can connect the controller to your PS4. If the light bar isn’t on, make sure you’re using a functional wall outlet. If the problem persists, try a different charging block and/or charging cable. You can also test your PS4 controller.