Fujifilm NP-W126S Li-Ion Battery Pack.
For using the maximum power of your X-T2 or X-Pro2 mirrorless camera, the Fujifilm NP-W126S Li-Ion Battery Pack has been designed to better manage heat and ensure lightning fast camera performance. This battery is also compatible with older cameras that use the NP-W126 battery pack, but users will not see any performance advantages in those bodies.
Highlights:
For Select X-Series Cameras
Improved Heat Management
Compatibility:
X-T2
X-Pro2