The battery pack is only compatible with the 2nd generation DxO ONE camera.
To identify the generation of your camera:
1st generation: the serial number is printed in 2 parts, above and below a QR code, on the back door of the camera. Your camera is not compatible with the battery pack.
2nd generation: the serial number is engraved under the camera. The camera is compatible with the battery pack.
The coming purchase process will verify the compatibility for you by requesting the serial number of your camera. For incompatible cameras, a particular process is proposed on our online shop.