The Galaxy S10 is expected to deliver a bunch of new features, including a few features that no other flagship smartphone will have to offer — not even the iPhone. But a new rumor says that the upcoming Samsung phone could pack an even more exciting feature than anything we’ve heard about previously, one that you’ll only notice when you charge your phone.

The Galaxy S10 phones will deliver a bunch of features that people can’t wait to get their hands on, including an Infinity-O screen design, multi-lens cameras on the back, and an in-display fingerprint sensor. Samsung’s Infinity-O OLED screen tech will outperform all comparable designs for the foreseeable future. The multi-lens cameras on the flagship phones will deliver better performance than similar camera modules available on mid-range Galaxy A-series phones. The in-display fingerprint sensor Samsung is using in the Galaxy S10 will be an ultrasonic one, something no other Android device has. Also, very few competitors will be able to deliver all of these technologies in a single phone.

According to twitter leaker @MMDDJ_, Samsung will use graphene batteries, which explains why the Galaxy S10 phones will have faster charge speeds. Graphene is material that the tech world expects to solve a bunch of problems in the future. And while we’re yet to see graphene used in commercial products.

There’s no confirmation the Galaxy S10 will have graphene batteries. And let’s not forget that Samsung can’t afford any missteps when it comes to battery safety after the whole Galaxy Note 7 mess. That said, if these leaders are correct, the most exciting thing the Galaxy S10 will have to offer might have nothing to do with its nifty new design, camera capabilities, or in-display fingerprint sensor.