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I have used this during two power outages, and it performed pretty much as I had expected. I used this power supply for over two hours charging my laptop and maintaining the charge. It used a whopping 1% of it's charge capacity. It was at 99% charge when I stopped using it. I do recommend this portable power supply. I bought mine on sale, so that is a plus. I really like how it doesn't lose power while sitting. It sat a couple months since it's last use and was at 100% charge.
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I run out of devices to charge with this unit.
Portable power bank is as described, and charges pretty fast. This is replacing a much older power bank that doesn't hold it's power for very long. It's from a different manufacturer, too.