Galaxy Note 9: How the S-Pen is being charged?
The S Pen must be charged before you can control apps remotely by using the S Pen button. When you insert the S Pen into the slot, charging will automatically start.
• If the back of your device comes into contact with a magnet, the device may not recognize the S Pen and it will fail to charge the S Pen.
• Even if the S Pen has been fully discharged, you can use other S Pen features, such as tapping the touchscreen or the Air command features.