AmazonUS has a deal running on the Anker PowerCore Battery Banks, which are officially recommended by Fujifilm to power and charge their X and GFX series cameras.
- Anker PowerCore Speed 20000 PD – save 17%
- Anker PowerCore+ 26800mAh – save $30.00 thanks to coupon code applied at checkout
I own the Anker PowerCore+ 26800mAh and I am very satisfied with it. I use it mainly to charge my MacBook Pro when I am on the road, but of course it works great also to charge my Fujifilm batteries.