All of us have been there. You’re on a train or in an Uber and you’ve got an important phone call coming in. You’ve squandered the last of your battery binging on K-Pop TikToks. You go to plug your phone into the outlet and it doesn’t work, or it simply isn’t there. You can envision the perturbed emails in your inbox, imagine the emotional energy it’s going to take to reschedule the call, the number of Doodle polls it’s going to take to get everyone on the same page again. If only there were something you could do. Oh, wait! You’ve got a power bank in your laptop bag! But which kind is it? Has it held a charge? Will it give your phone enough life to last for the call? If you’d read this list ahead of time you would have been prepared. So let’s just pretend you did.

Reliable and affordable. Amazon

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The Anker PowerCore Slim 10000 PD can store three full phone charges; has universal high-speed charging; is portable, light, and sturdy, and comes in an array of colors. Best of all, it is inexpensive. If all you want is a backup with no major frills you can’t do better than this.

Top off your computer. Amazon

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If you do a lot of work in the field away from traditional infrastructure, this RAVPower will keep your laptop and phones running. Journalists, photographers, and videographers often find themselves needing to upload large amounts of data quickly and not in the most convenient of locations. Thanks to type C and USB ports, you can charge multiple devices at once, including your Macbook and iPhone. The RAVPower packs so much power you can expect to be able to charge your phone or tablet several times before having to recharge the bank.

All-in-one solution. Amazon

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One of the more annoying aspects of traditional power banks is that they also need charging. That traditionally means the power bank will monopolize a phone cord, while the phone will require another to charge. The PowerCore Fusion 5000 fixes that problem by making the bank itself a wall charger. Find an outlet, plug in your bank, and you can connect two phones to it at once. Its foldable design makes it portable and sturdy. It also supports quick-charge technology.

For larger groups. Amazon

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With 4 USB ports and both 12V and 20V outputs, you’ll be able to charge a ton of devices on the go and all at once. Whether it’s a fan, a laptop, a router, a camera, a Nintendo Switch, or, yes, just a phone, this MAXOAK covers a lot of ground. It does not have USB C functionality to make sure your devices are compatible.