Conclusion: I bought a used battery, with about 88% power and 271 charging cycles to one, admittedly, a reasonable price.
2 stars, ---> battery works, fast delivery, no shipping costs but on the "used" status of the batteries should clearly inform the seller!
Addendum: I asked the facts establishing the seller. Answer: "I'm sorry, there was probably a mixed delivery of my supplier." I was immediately, within 48 hours, a new battery sent (mail from France), that of course is top! After I installed it and my iPhone no longer Mux gave out, the battery is not charged, I switched back to the first, used ..... so this battery seems to be broken! Because me the whole affair with back and forth on iPhone and iPhone to replace battery and generally, has become annoying, I waive a renewed complain .... this property is and will remain for cheap money a surprise package! ;-)