Are all battery banks built the same? – Head to head ~5000 mAh Showdown!

Does brand matter when it comes to battery banks?

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Intro Screen Music Credit:
Title: Laszlo – Supernova
Video Link: https://www.youtube.com/watch?v=PKfxmFU3lWY
iTunes Download Link: https://itunes.apple.com/us/album/supernova/id936805712
Artist Link: https://soundcloud.com/laszlomusic

Outro Screen Music Credit: Approaching Nirvana – Sugar High http://www.youtube.com/approachingnirvana

Sound effects provided by http://www.freesfx.co.uk/sfx/