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This ultra-thin power bank I tested is a must-have travel gadget (and it gets a price cut for Amazon Prime Day)

The Auskang 5,000mAh power bank is only about as thick as a few credit cards, but it has enough power to reliably charge your smartphone or other USB-C device. And Amazon Prime Day sees the price slashed.

That said, I'm acutely aware that the bigger the power bank, the more likely it is to be left behind, leaving my devices without those sweet electrons. I've tested portable chargers of all sizes, but recently I had the chance to get my hands on the Auskang 5,000 mAh power bank, an ultra-thin device that's about the same thickness as a stack of coins, and it didn't disappoint. This brilliant twist adds versatility, meaning you don't need to carry an extra cable or rely on wireless charging.

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