Concept well, implementation miserable

Ordered around for long bike rides, Galaxy Note II and spare battery at night in the hotel room to be able to (usually short on outlets) charge, at the same time. In addition, the backup battery will save space aufbewahrt.Nur a charging cable / power supply unit has carried in the charging station. Conscious renunciation of audio output.
Result: Charging contact for Smartphone very unsure smartphone must be depressed right, but even fast walking on a wooden floor interrupts Contact! Because to me the concept has fallen, I thought I could live with it.
When I tried to load in place of the supplied batteries Samsung battery replacements, I changed my mind very quickly: original battery fits very sluggish in the tray, I got it only using a razor blade as a lever out again!
I think concept still for good. Umsetzng miserable. Thus, the product is not marketable.
Samsung should finally make the accessories market as its own, and so off a few black sheep.