The processing of the battery can not be better - The battery has a solid metal casing. A transport in the backpack should be no problem, the shell is very stable and lies a lot. The battery has 2 outputs which are marked with 1A or 2.1A. According ammeter both my S5 load but equally fast.
It is switched on the battery over a stable push button with clear pushbutton the press clearly when "clicked" .When test with a Galaxy S5 (charge level 40%) I attach the ammeter 1,41-1,42A charging current. For comparison, I measured with my strongest batteries immediately afterwards and reach 1,79-1,80A charging current, which Complies per PSU in about the loading speed. The Power Bank is therefore a bit slower than the original charger and takes a little longer to charge the phones. Therefore, a point deduction.
Nor included in the delivery, a USB charging cable Octopus with 4 ports:
Micro USB
Lightning
USB 3.0
Apple Iphone old
With this cable, the phone loads but only with about 0,96A - too slow for me. Nevertheless, the cable is a "Friendship Maker" makes sense. I have it in the drawer and can each friend / work colleague always helping out with the appropriate cable. The scope of supply also includes a protective cover for transport.
Conclusion: Great battery with a massive shell, chic design with slight weaknesses in loading speed. To whom does the speed is not the sole criterion, can strike.