there is a battery of 1200 mAh and 1900 mAh not as advertised ...

By cons, as announced in the object, it is actually a battery of 1200 mAh. I was hesitant at the time of order because I had noticed that it was a battery of 3.7 V and 4.51 Whr. Simply apply the following formula to realize the reality of the thing:
4.51 / 3.71 = 1.218 A / 1000 = 1218 mAh
After testing it is well aware that holding the charge is the same as the original battery of the iPhone (just over 24 hours in normal use).
Just browse the net to find the number of this type of batteries sold in high capacity (1900 mAh) and thereby realize the enormity of this scam ... lamentable and regrettable ... that that benefit importers and unscrupulous sellers.