Sleek design, but does not hold a lot of charge.

This is the smallest power bank I own. I love that it is light, compact and ergonomically comfortable in the palm of my hand. It does charge my Samsung very fast. However, it will only charge my smartphone once on a single charge (very disappointing when compared to most of my other ones that would charge more than twice the same phone on a single charge). It shows the available charge by means of 4 blue LED lights  (25, 50, 75 and 100% ). I guess it makes a good but not great emergency backup power charger. 

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https://www.amazon.com/Ewarmer-5200mah-Portable-Charger-Powerful/dp/B0753DV388