Anker makes great power banks, but the caveat is that they are a lot more expensive than other brands. If you're on a budget, Amazon is offering this powerful and high capacity Poweradd Pro 27,000mAh ...

This ultra compact POWERADD EnergyCell Portable Charger 10000mah Power Bank with great reviews is only $11.47 (reg. $19.69) with this deal at Amazon right now! It has 2.4A output and only weighs 6 oz.

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