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2 years. Not bad

This device lasted 2 years with moderate use from me. The power bank can charge my iPhone 5s full charge 3 times before being drained completely. Charging the power bank takes a long time, I usually plug the power bank to an electric socket around 11pm and then it becomes fully charged around 7-8am the following morning. You can charge two device at the same time. I was also able to charge devices via the power bank while also charging the power bank itself (I'm not sure if it a good practice). http://mobile.gjamoroso.com/2014/08/pny-power-78s-power-bank-review.html

G
Gj Amoroso
23 Aug 2017
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