The battery of the "Xbox Play & Charge Kit [USB-C]" does not mount directly in place of the controller's standard battery compartment. Instead, it replaces the battery compartment cover of the controller. Here's how it works:

- The rechargeable battery is inserted into the battery compartment of the controller, replacing the standard battery covers.
- The rechargeable battery cover attaches to the back of the controller, ensuring that the USB-C connection is accessible for charging.

Thus, this is not a simple battery replacement, but rather an adaptation that replaces the battery compartment cover with a rechargeable battery.