| Pros | Cons |
|---|---|
| Two USB-C ports | Slow recharge time |
| Excellent performance | Max output is capped at 65W |
| Nice finish | LED counter boots slowly |
| Runs warm during discharge |
If you’d told us two months ago that a Belkin product would take the top spot in our tests, we probably would’ve laughed. But after running the Belkin 20K Power Bank through our full suite of stress tests, it’s officially the most well-rounded performer of the year. Between the top-ranked efficiency, stellar build, and excellent real-world output, this thing punched far above its weight. Which again, is surprising for a Belkin product.
Looking for power banks that actually perform? Check out our Top 5!
How We Test
We’re reviewers, not influencers. What does that mean? It means we test everything our way before we share the results. None of the content we produce is sponsored so you don’t have to wonder if we’re just trying to sell you something.
For battery banks in 2025, here’s what what we tested:
- Charging protocols – We did timed charge tests for every protocol that the battery bank claimed. For example, a battery bank might advertise PDO’s of 15W, 27W and 60W. We would run voltage stability tests for each rate. We do the same for PPS as well.
- Temperature – We captured the temperature of the battery bank for all the charge tests and noted any overheating, throttling or failure to maintain the chosen output.
- Capacity test – We fully charged and discharged each battery bank using a PD controller and an e-load. This method pushes the battery harder than normal use, revealing when it fails to maintain proper output instead of just dropping to a lower voltage.
- Recharge tests – We measure and timed the amount of energy required to fill the battery bank completely. We didn’t rely on the counters on the packs, instead we had hard cutoffs coded into our test programs
- Efficiency – From our charge/discharge tests, we calculated several efficiency values to see how much usable energy you get compared to how much went in.
Design
The Belkin 20K has a 71Wh (20,000mAh) capacity with two USB-C ports and one USB-A. Unlike some other brands, both USB-C ports perform the same way, so you can plug into either without losing charging speed. It’s capped at 65W, which isn’t the highest we’ve tested, but it covers most mid-tier laptops, tablets, and smartphones just fine.
There’s a LED counter on top. It’s clean and easy to read, but takes a second to wake up when you plug in. It’s a minor annoyance, but worth mentioning. Overall, the build feels solid, and the matte finish keeps fingerprints away.
Performance
This is where the Belkin 20k blew us away. It pulled 53.2Wh out of the stated 71Wh in our 65W full-discharge test, earning it a #1 efficiency rank at 73.6%. Fixed PDO accuracy hit 93.7% and PPS came in strong at 88.9%, making it one of the most reliable performers for dynamic charging scenarios.
The recharge side was a mixed bag. It hit the 45W max. but didn’t hold that rate for long. It took nearly 4 hours to fully charge (from our charge curve, the average was about 20W). That’s not ideal, but the tradeoff is the impressive discharge performance and efficiency. For most users, that’s what matters more.
Thermals
The Belkin 20k ran a bit hot during discharge testing, with temps reaching 49°C. That’s warmer than average, but not alarming. During recharge, it stayed much cooler (32.3°C), likely due to the slower input rate. Overall, thermal behavior was stable, if not exceptional.
Value
Priced at $90, this power bank sits in the mid-tier price bracket. At $0.68 per watt-hour, it’s not the cheapest but it delivers enough real-world power to justify the cost. You also get a short USB-C cable in the box. For someone looking for reliable, high-efficiency backup power that works with nearly any device (especially Android and Windows), this is a great value pick.
Verdict
Would we use it as reviewers? Absolutely. The Belkin 20K Power Bank doesn’t have the flashiest wattage or the fastest recharge, but it nails the fundamentals. It’s efficient, durable, versatile, and easy to use. If you’re looking for a well-balanced power bank that performs beyond its label, this one earns its top spot.
If you want to see what our Top 5 Battery Banks are for 2025, check out this list!