Hi Jimmie!
Thank you for reaching out to us. We appreciate your interest in knowing if you can use a USB-C charger and if the warranty still works. A rechargeable battery powers your device. A compatible, reversible USB Type-C cable is included with the device. The USB Type-C cable can use a USB Type-C travel adapter, portable charging devices, smartphones, laptops, wireless charging, and other devices that offer USB-C ports, both for charging and data transfer. Please be advised that using third-party chargers may invalidate your warranty and cause damage.
For more information, you may visit this link: https://www.samsung.com/us/support/answer/ANS00078994/.
Should you need more assistance, please feel free to get back to us via the following options:
1. Facebook Messenger: http://m.me/samsungsupport
2. Twitter: https://twitter.com/messages/compose?recipient_id=18768513
3. Samsung Community: https://us.community.samsung.com/t5/Samsung-Community/ct-p/us
Reference #: 1144218950
Have a great day.
Melardo