Now I have 2 Patona batteries and I have determined the discharge curves. A battery had the promised capacity, the other a markedly lower. Also I noticed that both batteries obviously from different suppliers came despite Patona stood on both batteries.
The discharge curve of Patona batteries is much flatter than that of the original Fuji battery resulting in the battery indicator on the camera does not work properly. The camera shows a long time at full and then empty in no time.
Therefore, the batteries are only conditionally recommended.