Look and feel: We took note of each power bank’s bulk and exterior texture, and considered how easy and intuitive its features were to use.Size: Rather than measure the dimensions of each power bank, we considered size in terms of whether a power bank fit inside a wallet, a pocket (we tried a variety of pants, skirt, and jacket pockets), or an accessories pouch.Weight: We used an Escali Primo Digital Scale to confirm the advertised weight of each power bank.This type of feature is indispensable when executed well, since separate charging cables (even if they’re neatly coiled up) take up more space in a bag. Built-in cables: We preferred power banks with some type of built-in cable or plug. Price: We used a ratio of capacity (mAh) per dollar to break ties between otherwise similar models.We discounted models still undergoing a crowdfunding campaign, as well as brands lacking a visible web presence. Brand reputation: We favored brands that we’ve had good experiences with in the past when it comes to responsive customer support and product reliability.At least a one-year warranty: A year is plenty of time to use your power bank and make sure it’s working properly, although longer warranties are always preferable.Since batteries with a capacity rating of more than 10,000 mAh tend to be bigger, heavier, and more expensive, for this guide we focused primarily on those with enough capacity to give your phone a boost of power or to fully charge it several times. Capacity rating of 2,000 to 10,000 mAh: The capacity rating listed on the power bank tells you roughly how much power it can hold. We preferred to test power banks weighing 8 ounces or less, since we don’t think most people want to carry something in their pocket or purse that weighs much more than a smartphone (for reference, an iPhone 14 weighs 6.1 ounces and a Pixel 7 weighs 6.9 ounces). No heavier than half a pound: Power banks should be small and lightweight, making them easy to tote around in a wallet, pocket, or bag for an entire day.Anything less powerful would be painfully slow. Likewise, for models with USB-A output or Micro-USB input, we looked for those rated for 8 watts or more. That’s the minimum wattage needed for full USB-C charging and recharging speeds (though devices that support the even faster USB-C standard- USB Power Delivery, or USB PD-need at least 18 watts).
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