Smaller devices such as an iPhone 8 or newer, a Google Pixel phone, or a Nintendo Switch can be charged safely from most USB-C ports, but they only need 18 watts to charge at top speed. A 13-inch MacBook Pro needs at least 60 watts to charge at top speed, but it still charges (albeit slowly) with a 30-watt charger. Most laptops powered over USB-C need at least 30 watts to charge at top speed-that’s why the 12-inch MacBook and the 13-inch MacBook Air laptops come with a 30-watt charger. Has at least a 30-watt output: We required each power bank to support an output of 30 watts or higher. Has USB-C Power Delivery (PD) charging: We required every model to have a USB-C port supporting the Power Delivery (PD) standard, which enables the fastest possible charging (output) and recharging (input) speeds.Maximum measured output: 60 watts Maximum measured input: 60 watts Capacity rating: 20,000 mAh Weight: 0.9 pound It also has the same rated capacity and the same USB-A output ports. Just like its twin, it weighs just 0.9 pound, and it’s slim and sleek enough to be easily slipped into a backpack or briefcase pocket. Like the PowerPack 20000, the PowerPack 20K Pro doubles as a hub, so you can plug keyboards, flash drives, and other peripheral devices into its USB-A ports. But the PowerPack 20K Pro is a great option if you want to charge a heavy-duty laptop (or even a moderately sized laptop like the 13-inch MacBook Pro at the fastest possible speed), or if our top pick is out of stock. It’s not our top pick because it won’t offer a noticeable improvement for most people, especially with Chromebooks and other laptops that don’t need the extra power, and at this writing it costs about $30 more. It’s nearly identical, except it offers a higher maximum output rating (60 watts) than any other portable charger we’ve tested. If you have a large, power-hungry laptop (for gaming or video and photo editing, for instance) and want to charge it while running lots of programs, the ZMI PowerPack 20K Pro is better suited to your needs than the PowerPack 20000. Maximum measured output: 40 watts Maximum measured input: 60 watts Capacity rating: 20,000 mAh Weight: 0.9 pound To top it all, the PowerPack 20000 has a sleek, sophisticated look compared with most power banks-it’s not much bigger than a Hershey’s chocolate bar, and it weighs less than a pound. And while some laptops need more power to charge at maximum speeds, the PowerPack 20000’s 40-watt-rated output is powerful enough to work with a wide range of models, charging smaller Chromebooks at their maximum speeds and larger MacBooks at respectable rates. If you have a laptop that has only USB-C ports, this means you don’t need separate adapters to use USB-A devices such as wired mice or keyboards.Ĭharging efficiency always varies depending on the age of your devices and the number of programs you’re running, but the PowerPack 20000 has enough battery capacity to fully charge laptops such as the 13-inch MacBook Air or Dell XPS 13 at least once, the Nintendo Switch at least twice, or a smartphone like the iPhone 13 or Samsung Galaxy S21 about three times. Its hub functionality-an uncommon feature that we insisted on for the laptop-focused power banks in this guide because we think it’s particularly useful-lets you recharge a laptop over the USB-C port while also powering or transferring data to your other devices over its two USB-A ports. The ZMI PowerPack 20000 is the total package.
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