The fit is mediocre. The USB port is perfectly placed, the smartphone clings total also nice in the bowl-shaped recess of the battery casing. Unfortunately, the smartphone is slightly wrong with my battery case on the bottom, but this is hardly noticeable. Much disturbing I find that the lower retaining clips probably not hold a smartphone for optical reasons to above and thus only low holding. The battery case is due to the strong connection to the USB interface always in place but the feeling is hard feelings, that all hold load is almost alone in this plug.
The USB connector of the battery case is also such a thing from a lack of precision work. Had been a little more effort in choosing the plug, you may have found a flacherere execution and the huge bump would have been significantly smaller. The USB socket to recharge mobile phone and case, can now be found on the left side.
To use: In general, the case is working properly. You can decide at any time via button if you want to charge your smartphone or Case. Unfortunately, this is purely manual, the case is therefore not able to automatically turn on the smartphone when it itself is fully charged. If you have then charged both batteries, you go to choose whether to load the internal battery or the external add on, which then recharges its internal buddy. Just a handy thing!
It would be just nice if the bullshit dwarf would not have slammed here. You can catch aufgeschnalltem Case smartphone no longer connect to the data transfer to the computer! This is a real knock-out criterion and only the utter lack of alternatives to this case, let me keep it. The rigid USB connection and some fummlige separating the two units from one another, lets me think anxious because the Smartphone soon has a worn-out jack. So I let both units together permanently and transfer data only once rather tedious via Bluetooth. Who synchronized permanently smartphone and computer (eg Outlook), is in a fix and should refrain from Battery Case or always, be very careful when taking off and putting.
CONCLUSION: The implementation is, as is unfortunately too often, neither particularly well thought out still really well done. Various details simply do not vote and the lack of data connection to the computer is a bad joke. As an external battery works the case, however, and that is the crux of the matter!