Dock, store and charge your Xbox Series S/X controllers and ensure your game pad is ready to play as soon as you are. Includes 2 x 850Mah rechargeable battery packs that simply clip into your controller, removing the need to be constantly spending money on expensive disposable ...Dock, store and charge your Xbox Series S/X controllers and ensure your game pad is ready to play as soon as you are. Includes 2 x 850Mah rechargeable battery packs that simply clip into your controller, removing the need to be constantly spending money on expensive disposable batteries.