The dualsense will use an internal battery, similar to how the Dualshock 3 and 4 had internal batteries. They can be removed but it will require you to take the controller apart in order to do this which could void the warranty.
PlayStation 5 is an upcoming game console by Sony and is being released as the successor to the Playstation 4. The console is set to release in the holiday season of 2020
RECENT PLAYSTATION 5 QUESTIONS
Is it possible to use the same external hard drive for games on the PS5 and the Xbox Series X? If i partition it can i use the same drive on both consoles for playing games? View Answer
Will rechargeable AA batteries work with the PS5 dualsense controller? View Answer