This is over now.
I have my shell from the iPhone and uses this as a new battery cover.
The iPhone will thus probably a little bigger and schwerer- I suppose but, if you purchase for almost doubling my battery life.
The mount could not be easier. Cell reinstecken- cover and you're done.
The remaining charge level is indicated by four LEDs. Each LED represents 25%.
When charging, the percentages to be loaded on flash, the already charged percents are lit continuously.
The build quality is impeccable.
Charged is here via Micro USB.
Since some headphone plug are too short also an extension cable is included.
I'm very satisfied!