The Universal Stylus Initiative (USI) and NFC Forum have announced that they will collaborate on a project to develop a new kind of charging for those mobile devices that come equipped with their own digital pens. Doing so via NFC might mean that the stylus in question could share data with its paired phone or tablet and power up at the same time.
https://www.notebookcheck.net/The-smartphone-or-tablet-stylus-of-the-future-could-charge-via-NFC.505236.0.html