USB-C Power Delivery 3.1 Architecture
Charging a modern 16-inch laptop in the field requires more than just high capacity; it requires advanced voltage stepping. The Anker Prime Power Bank implements the latest USB-C Power Delivery 3.1 standard, allowing a single port to push a massive 140 Watts.
This matters for larger laptops under heavy load, where a 60W charger can’t keep up and the battery keeps draining even while plugged in. Our guide to laptop battery life and power draw explains why.
How to Read Power Bank Specs
- mAh vs. Wh: The mAh rating refers to the internal cells at about 3.6–3.7 V. Watt-hours are the more useful number: Wh = mAh × cell voltage ÷ 1000, so 27,650 mAh × 3.6 V ≈ 99.5 Wh. Voltage conversion and heat lose some of that energy, so a device receives noticeably less than the rated capacity. See our explainer on mAh vs. Wh and conversion losses.
- Single-port vs. total output: The maximum single-port figure decides whether a laptop charges at full speed. The total output is shared when several devices are connected, so each port gets less.
- USB-C PD and cables: Outputs above 60 W need a 5 A (e-marked) USB-C cable, and 140 W requires PD 3.1 Extended Power Range support on the charger, the cable and the laptop. A basic cable silently limits charging speed. More in our USB-C Power Delivery guide.
Flying With a Power Bank
Under common airline and IATA rules, power banks must travel in carry-on baggage, never in checked luggage. Up to 100 Wh is generally allowed without approval; 100–160 Wh usually needs airline approval. Rules vary by airline and country, and some airlines restrict in-flight use, so check before you fly.
Which One Should You Choose?
- Anker Prime 250W: Choose it if you need to charge a 16-inch laptop at full speed and want real-time output readouts. It sits just under the 100 Wh carry-on threshold.
- Nimble Champ: Choose it for phones and earbuds when pocket size matters more than capacity. It is not a laptop charger.
- AsperX 165W: Choose it if you want integrated cables and enough output for a mid-size laptop plus a phone at the same time.