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ZDNET always tests products before we recommend them, whether that's hands-on testing in our home or data-based testing in our lab in Kentucky. We've tested everything from tablets, portable power stations, and more to award them a Lab Award badge for outstanding performance.
For our power banks Lab Award, out of the 10 devices we tested in the lab, the Cuktech 15 Air charged to 100% the fastest. And right now, during Prime Day, you can get this award-worthy power bank for $64 ($16 off).
Also: June Prime Day live blog 2026: We're tracking Amazon deals on SSDs, TVs, laptops and more
Based on our data-driven comparison of how quickly each unit reached charge milestones of 50%, 80%, and 100%, the Cuktech 15 Air reached 100% battery in only 54 minutes. It also took only about 26 minutes to charge to 50%, which is great for those who want a quick top-up.
This power bank is also thinner and lighter than most 10,000mAh power banks, weighing in at just .6 pounds. The 15 Air has three outputs: two USB-C ports with maximum outputs of 65W and 27W, and a USB-A port with a maximum of 18W output. This means this one power bank can charge your laptop -- albeit not at full speed -- a smartphone, and a legacy or low-power bit of kit.
Review: Cuktech 15 Air
It also has a brilliant color TFT display that shows you everything, from the battery charge level and current to the port outputs, allowing you to have finer control over charging.
If you're looking for a power bank to buy during Prime Day, make it the Cuktech 15 Air, especially at it's 20% off discount.
According to our deal-rating system, this 20% off deal should be rated 3/5, but since this is a recent ZDNET Lab Award winner, I gave it a 4/5 deal that you don't want to miss out on.
Amazon Prime Day runs this week until the end of Friday, June 26. However, we usually see lingering deals a day or two after the event, but don't count on seeing remaining discounts on big-name brands after the event ends.
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This deal is listed as a Prime Day Deal, so it will end after the event is over on Friday, June 23, at 11:59 p.m. PT. If you want to snag our Lab Award power bank winner, make sure you buy before then.
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