For a while now, I've been looking for a power bank that I can use not only to charge all my USB devices but also over an AC power outlet for beefier devices. While I've used large, hefty power banks ...
Power banks designed for phones don’t do much for laptops and tablets. But the RavPower RP-PB055 AC Power Bank packs a whopping 30,000mAh, and more than doubles a MacBook’s time between recharges.
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