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Addendum:
As soon as I had written the review, a nice lady telephoned to apologize and tell me that I would get a new battery free of charge ... I call that great customer service !!! Now I expect the new battery and am curious if I'll have better luck with it. Thanks for the great service !!!
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The new battery is here and in use. Performance is good, hope it stays that way :-)
Super Customer Service!
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Addendum of 07/28/2014:
The replacement battery has now unfortunately also greatly diminished. (Without using the smartphone) as early as 4 hours after charging, the battery power goes back to 50%. That I use it only for about 3 months and no intensive smartphone users have, very disappointing !!!
Can definitely say not advise here. SORRY !!!