Especially the latter seem to some buyers (and reviewers) to expect when you purchase this device and put it into operation.
In the technical data is very clear that the solar cell ~ "generate" 100mA current can. This should have optimal conditions, that is neat sunshine, be present. And then the solar cell requires about 60 h (mind you in the sunshine) at the battery fully recharge. Simple electrical engineering and mathematics ...
Who is aware from the outset that will not be disappointed here!
I have charged the battery using the USB power supply of Poweradd and since then every now charged my iPhone so again. In the remaining time the device is "in the sun" (if it appears times) and is recharged again.
This has so far works great.
The solar cell I see around (phone empty and solar battery empty) and to come even in the event of cases back to power for the cell phone only as "Notladefunktion".
The device is working properly! Unless one uses it for what it is intended / designed.
I give it 5 stars!