I have gone through a few battery banks in my time so I consider myself to have a fair idea of the good from the bad. Upon unboxing I was very surprised with the weight of it. It doesn't feel cheap and flimsy. It has two USB charging ports, a 2.1A and a 1.0A there are indicator lights for the actual battery banks charge so you know when it is getting low. Input/Output is 5v with a 10,000 may you should have plenty of charges.
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https://www.amazon.co.uk/Portable-10000mAh-Emergency-External-More-yosib/dp/B071VLNFPD