Apple is looking at whether it can entirely remove the need for an Apple Pencil to ever be charged, and whether that will help it be used on an iPhone.
https://appleinsider.com/articles/24/04/11/future-apple-pencil-may-work-on-iphone-and-never-need-charging?utm_medium=social&utm_source=mastodon
Future Apple Pencil may work on iPhone and never need charging

Apple is looking at technology to entirely remove the need to charge a future Apple Pencil without removing features, and whether that will help it be used on an iPhone.

AppleInsider

@appleinsider a good and USEFUL pencil would probably need charging.

They already sell styluses

@Chancerubbage @appleinsider with current consumer electronics technologies I think so too, but I am sure, that there are technologies in development where you won’t need a charger, as the power is created on demand. There are already smart home light switches where the press of the button creates enough energy to send data to your hub.

NFC is another example where the tag does not need power. All necessary power is induced by the reader