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. Rugged and portable design: Since these devices are often used outdoors, we assess their exterior materials’ resistance to scuffs and scratches.Anything heavier than that can be hard to load and unload from a car or to carry around a house in a blackout. We set a weight limit of 50 pounds, a heft that one (strong) person or two people can reasonably carry. Maximum weight of 50 pounds: Most portable power stations are too big and heavy for the average person to carry them for long distances on foot.Output rating of at least 200 W: Lower outputs are fine for charging phones and other small electronics, but you need 200 W or more to charge a few devices at a time, especially if one is a high-powered device like a laptop.Battery capacity of at least 300 Wh: A watt-hour (Wh) is literally the measure of watts per hour, so a battery with a 300 Wh capacity can run a 300 W device for one hour.This allows them to safely run appliances with a powerful motor or critical devices such as a CPAP machine. Pure sine-wave inverter: We require each model to utilize a pure sine-wave (PSW) inverter, which produces electrical waveforms as clear and smooth as those of the AC power coming out of any wall outlet.
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