There are many times when it's just nice to have a portable backup battery around. For fifty bucks, you can typically snag a pack with a capacity anywhere between 10,000mAh to 15,000mAh, enough to recharge a modern high-end smartphone four or five times. Yet if EC Technology's new external battery pack available on Amazon is genuine, it offers a whopping 22,400mAh of power. That much juice could recharge a phone up to ten times, all for the same $49.99.

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