Whether you call them battery packs, power banks or portable chargers, these accessories do one thing well: charge devices when you can’t find an open outlet. Small enough to fit in a day pack and sturdy enough to live at the bottom of your carry on, battery packs can charge your smartphone, tablet, laptop or even all three at once, depending on the size of the battery. What size you’ll need, and any extra features you may find useful, will largely depend on the devices you plan on charging up. With so many options on the market right now, we tested out a bunch of models to determine the best portable power banks you can get right now.
What to look for in a portable battery pack
Battery type
Nearly every rechargeable power bank you can buy (and most portable devices) contain a lithium-ion battery. These beat other current battery types in terms of size-to-charge capacity, and have even increased in energy density by eight fold in the past 14 years. They also don’t suffer from a memory effect (where battery life deteriorates due to partial charges).
One drawback you may have heard is the possibility of lithium ion batteries catching fire. To limit the danger, battery packs require internal mechanisms to limit things like voltage and pressure. While you should still make sure a battery isn’t exposed to unnecessary stress like excessive heat, damage from drops or operating in freezing weather, battery packs are considered safe enough to bring on an airplane. According to the TSA, external batteries rated at 100Wh or less (which all of our recommendations are) can fly with you – just make sure you stash them in your carry on as they aren’t allowed in checked baggage.
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