| Pros | Cons |
|---|---|
| Compact design | 30W max output |
| Excellent performance | Tends to overheat |
| Budget Friendly | Basic LED status counter |
The updated Anker Nano 3-in-1 Power Bank is one the best battery banks we tested this 2025. It’s efficient, compact, and packed with features. In fact, it’s likely to be our go-to battery bank this year for everyday carry.
But we discovered a potentially fatal flaw if you’re pushing it to its limits. So while it’s a top-tier pick, it’s not without caveats.
Looking for power banks that actually perform? Check out our Top 5!kl
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
This is a 10,000 mAh pack rated at 36 Wh, and Anker managed to shrink it into one of the smallest all-in-one form factors we’ve tested. It features a built-in USB-C cable (that doubles as a carry handle), one USB-C port, and a foldable wall plug for direct charging. The LED counter is simple as it just shows charge/discharge status and percentage. It gets the job done.
Compared to the older Anker Nano, this is a serious upgrade in portability and convenience. The finish combines glossy and matte textures, and despite its compact design, the energy density is surprisingly solid for a unit with integrated cable and plug.
Performance
Charging performance is excellent. The Nano 3-in-1 hit a Fixed PDO score of 94.8% and PPS score of 92.1%, both ranking #2 across our entire test group. Output is capped at 30W, which is fine for smartphones and tablets, and even light laptop top-ups in a pinch.
We pulled 26.72Wh out of the stated 36Wh capacity, giving us an overall discharge efficiency of 74.2%. Recharge efficiency was even better, requiring just 40Wh needed to fill the bank, resulting in a 67.3% input/output ratio, one of the higher values we recorded in testing. It recharged via USB-C in under two hours and just a bit longer when using the wall plug.
The best products we tested have efficiency scores around 70%!
Thermals
This is where the trade-off kicks in. During our max output discharge test, the pack hit 50°C and dropped from 30W output due to thermal fallback with around 33% charge remaining. That’s a potential issue if you regularly push the full 30W, especially in warmer environments. Discharge temps averaged 46.6°C, putting it near the top of the heat charts. For recharging, it was below average at 34.1°C, but thermals remain the biggest limitation here.
We will note that that our testing method pushes the battery pack harder than normal use so we’re not too concerned about the thermal throttling of the battery bank. Most charging curves on modern devices isn’t a straight line at max speeds.
Value
At just $36, this power bank delivers a strong blend of utility and performance. It’s not the best in terms of price-per-Wh ($0.74), but that’s expected with built-in components. You’re paying for convenience and in this case, it’s worth it. Between the wall plug, integrated cable, and excellent efficiency, it’s hard to find anything better in this size class.
Instead of carrying a cable, charger and battery pack, you could just carry the Anker Nano!
Verdict
Would we use if we are not reviewers? Absolutely. Despite the thermal caveat, the Anker Nano 3-in-1 is the compact power bank we’ll be carrying most often this year. For smartphones, tablets, and portable convenience, it hits almost every mark. Just don’t expect it to stay cool if you’re maxing out the 30W port for extended periods. That flaw aside, it’s one of the best pocketable power banks you can buy right now.
If you want to see what our Top 5 Battery Banks are for 2025, check out this list!