What's the real capacity of Power Banks/ Portable Batteries?

What's the real capacity of power banks? Find out here! Find Power Banks on AMAZON: http://geni.us/jmOp6dQ - Powerbanks used in this video: Aukey 20000mAh, Poweradd 10000mAh & 12000mAh, EC Technology 22400mAh, 5200mAh, 2400mAh The results may vary with different power banks from different manufacturers and some may be better or worse than others. ============================= Affiliate Disclosure: ============================= Some of the links used in the description will direct you to Amazon, as an Amazon Associate I earn commission from qualifying purchases at no additional cost to you. =============================