| Pros | Cons |
|---|---|
| Built-in USB-C cables | Unstable performance |
| Great smart display | Expensive |
| Supports wide range of PDOs and PPS | Low PPS and PDO stability scores |
| Awkward standing design |
When Anker announced the new 300W 25K laptop power bank, we had high hopes. With twin USB-C cables, a large smart display, and the promise of 165W total output, it looked like a solid upgrade over 2024’s Anker Prime. But after weeks of testing, we found ourselves let down by inconsistent power delivery and overall efficiency that falls short of the competition.
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
This power bank nails the design front. It’s a sleek unit with two integrated USB-C cables (one retractable and one shaped like a handle) plus a USB-C port and a USB-A port. The smart display is crisp and easy to read, giving real-time output data. But its vertical design is odd. Anker clearly wants this to stand upright, but there are no rubber feet on the base, and it topples easily. It’s frustratingly unstable on a desk or nightstand.
Performance
On paper, Anker 300W is loaded. It supports eight PDOs including up to 100W, and two 5A PPS profiles. In practice, though, performance is spotty. PDO accuracy came in at just 70% (ranked 14th) and PPS at 61.4% (12th). During testing, power delivery fluctuated frequently and a 100W discharge failed at just 30%. To make it worse, the bank locked us out of 100W mode after that. While we were able to drain the full capacity, it never felt reliable.
The best products we tested was far more consistent than Anker 300W. Check out our Top 5 if this doesn’t inspire much confidence in you.
Thermals
Thermally, the bank held up fine. Discharge peaked at 42.2°C while recharge at 37°C both within acceptable ranges. We didn’t encounter heat-related throttling or safety cutoffs, but the inconsistent power stability made us hesitant to trust this pack with power-hungry devices.
Value
Anker 300W costs $120. That’s a steep price for what feels like a mid-tier performer. Measured capacity was 59.93Wh out of 90Wh stated, and recharge efficiency was only 62.4%. At 595g, it’s also one of the heaviest packs in our test group. Energy density is below average and that price-to-performance ratio just doesn’t add up, especially when other banks offer better specs and reliability at a lower cost.
Verdict
We really wanted to like Anker 300W. The design is top-notch, the display is great, and those built-in cables are convenient. But that’s where the praise stops. Between its unstable power delivery, low protocol stability scores, and disappointing efficiency, it simply doesn’t live up to the Anker name. If you’re eyeing a 25K bank for your laptop, skip this one and consider more reliable options.
If you want to see what our Top 5 Battery Banks are for 2025, check out this list!