new Aukey powerbank. 20 000 mAh. charges Samsung, iPhone and rest of cell phones.
after its empty, just plug into electricity, charge it up and it can be used agan.
charges (depends how used and young/old is cell phone battery, current) around 5..6 times Samsung, 7 times iPhone 7. easy to use and it has also digital display to follow how much energy has left in it. easy to pack and take with You on journeys (anywhere where there is limited access to electricity, so Your phone doesnt run out of battery).
haven't been used at all.