Thank you Matsonfamily.
I have 6 original batteries with all the same problem. I never had this issue with my T1, and behoor the T1 with all my Nikon cameras. The camera was send to Fuji twice. The first time it came back with the note that the motherboard was repaired. The second time, they could not find, what they call Wandering Energy.
As all those tests are done without a lens connected, I did the same test with the 18-55mm on camera. At the start on july 5th, the battery was 100% full charged. And now this morning 10:00 a.m. the battery only has 54% energy left.
So I am not very happy about this. Is this an issue that exist in all fujicamera's?