- Portable power bank full#
- Portable power bank pro#
Charging output of USB-C ports: We measured USB-C output by connecting a half-charged power bank to a Total Phase USB Power Delivery Analyzer, an Apple USB-C cable, and a MacBook Pro. We then turned up the amperage of the load tester as far as it could go without overloading the power bank and recorded the volts and amps we measured with the PortaPow to calculate the maximum output (watts). Charging output of USB-A ports: We measured USB-A output by connecting a half-charged power bank to a PortaPow and a Drok USB load tester. We considered how easy and intuitive its features-such as the power buttons, charging-status lights, built-in cables, fold-out AC plug, or flashlight-were to use. Look and feel: We took note of each power bank’s bulk and exterior texture. Size: Rather than measure the length, width, and depth of each power bank-which would have been tedious, and not terribly meaningful for most people-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 mostly good experiences with in the past when it comes to responsive customer support, widespread availability, and capability to keep models in stock. 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, of course, always preferable. Our favorite power banks for laptops with USB-C or AC charging have much higher capacity ratings than the chargers we recommend here. Power banks with a capacity rating of more than 10,000 mAh tend to be bigger, heavier, and more expensive, so for this guide we focused primarily on lower-capacity power banks-those that store enough capacity to give your phone a boost of power or to fully charge it several times without weighing you down. Portable power bank pro#
For reference, an iPhone 13 battery has a capacity of a little more than 12 watt-hours (about 3,300 milliampere hours), and a 16-inch MacBook Pro battery has a capacity of 100 watt-hours (about 28,000 mAh). Capacity rating of 1,000 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 13 weighs 6.1 ounces and a Pixel 5a weighs 6.5 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.
Portable power bank full#
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).
Powerful charging and recharging: For models with USB-C output or input, we preferred those rated for at least 15 watts.
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