The Wireless Power Bank Our Tech Editor Carries to Keep His Phone Going
Specs
Capacity: 5,000mAh/19.25Wh
5,000mAh/19.25Wh Power output: Qi2 wireless: 15 watts, USB-C wired: 20 watts
Qi2 wireless: 15 watts, USB-C wired: 20 watts Dimensions: 4.0 inches tall, 2.8 inches wide, 0.3 inches thick
4.0 inches tall, 2.8 inches wide, 0.3 inches thick Colors: Black, white
The Nano is a Qi2 device, meaning it can wirelessly charge at up to 15 watts and magnetically attach to the back of iPhones (or the most recent Samsung Galaxy phones, provided you buy a case with magnets). That's not a totally new concept; we've tested plenty of wireless power banks before. But few pack in as much power in such a small package. This battery is just a hair thicker than an iPhone 16 or 16 Pro with a 5,000mAh/19.25Wh capacity. While that means it doubles the phone's thickness, it still fits very comfortably in the curve of the hand.
I tested Anker's power bank on my iPhone 16 Pro Max with a fully drained battery. It got the phone back up to 70% in two hours and 15 minutes. That's slower than a wired charge and even slower than some other wireless chargers we've tested. But the convenience is unbeatable, especially because you don't need to worry about carrying a cord. If you need a faster charge, you can always plug a cable into the 20-watt USB-C port (you just have to remember to bring one along).
How it compares to the competition
A company called Baseus makes a comparable model with a slightly smaller footprint, but it got a few degrees hotter in my testing—a little over 101 degrees Fahrenheit—and with that heat transferring through its aluminum casing, it became uncomfortable to hold. While the Anker measured only a few degrees cooler, it didn't feel as hot because of its soft touch finish. Baseus also has another 5,000-mAh model that looks unbelievably small in its Amazon listing. It looks that way because you shouldn't believe it—at 3.4 inches tall, 2.3 inches wide and 0.5 inches thick, it is relatively small, but not nearly as small as depicted.
If your bag or pocket space is at a premium but you want the security of some extra power, you'd be hard pressed to find a better option than the Anker Nano Power Bank. I plan to keep mine in my bag for those just-in-case situations, like days when I'm travelling or just spending most of my time outdoors, away from an outlet. I may still have plenty of things to be anxious about, but at least my phone's battery won't be one of them.
Editor's note: Anker issued two product recalls on different power bank models in June 2025. We don't believe the issues to be endemic across the company's lineup and we're satisfied with its response.
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