My reaction then was the purchase of the anchor Astro2.
What can I say ... My Nexus 5 is fully charged at all Astro2 2 charged times. In the evening at the outlet with two devices and you can almost 2 whole days to use the cell phone full wedding. The charging time of Astro2 with an old Samsung Galaxy S2 charger cable is approximately 8 hours - one night is enough! Using the supplied cable to the external battery can unfortunately only load on the laptop. But nowadays, almost everyone has some old microUSB charging cable laying around somewhere. ;-)
I am fully satisfied and more relaxed now when mobile phone use - you do not have to keep constantly the battery level in the eye. Full 5 stars!