Anker PowerCore+ 26800 PD
The same battery pack is sold still for €119 at Amazon Germany.
Hence, if interested, you better grab it now.
I own the Anker PowerCore+ 26800 PD myself, and I am very happy with it.
Fujifilm officially recommends the Anker PowerCore+ 26800 PD (and the Anker PowerCore Speed 20000 PD) battery packs for charging the following Fujifilm cameras via USB: Fujifilm X-T3*, X-T30*, X-T2*, X-H1*, X-E3*, X-T20*, X100F* and X100T*, X-T100**, X-A5**, X-A3**, XF10**.
*charging batteries while camera is ON or OFF
**charging batteries only while camera is OFF