![]() ![]() At least two USB-A ports: USB-A ports can charge small devices such as phones, tablets, and portable Bluetooth speakers, freeing up an AC outlet that you can then use for more power-hungry items.For this guide, we seek out portable power stations with at least two, which allow you to operate two or more AC-powered devices at the same time. None of our picks for the best USB power bank have an AC outlet, and our favorite portable laptop chargers have just one. At least two AC outlets: A pair of AC outlets is a bare-minimum requirement, since the majority of gadgets-from desk lamps to baby monitors-run on AC power.Informative display: Most portable power stations offer a battery meter to show you how much charge they have left, but we prefer displays that provide a precise percentage and other useful data. ![]() We also look for protective features such as port covers to keep out harmful dust and moisture.
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