The upcoming Galaxy Z Fold3 from Samsung has been confirmed to finally use the S Pen, and now an FCC list has officially mentioned that the device will be compatible with the S Pen Pro.
The new list confirms that Samsung has not yet released the stylus, which was announced along with the Galaxy S21 Ultra, will work with the upcoming foldable, which is explicitly mentioned along with the S21 Ultra, Note20 duo, Note10 Lite, Tab S7 series and Tab S6 . This group of devices supports Air actions via Bluetooth LE. The second upcoming foldable – Galaxy Z Flip3 is not mentioned in the list of supported devices.
The S Pen Pro itself is charged via USB-C and has a 100mAh battery rated at 5.0V. Z Fold3 is also likely to reverse the wireless charging of the pen similar to how it works in the Galaxy Tab series. The folding one probably comes without a dedicated space for the S Pen, so you’ll have to attach it to a case somehow.