Anker Nano Power Bank (10K, 45W, Built-In Retractable USB-C Cable)
Anker · Mid-range
A 10,000 mAh power bank with a 45 W USB-C output and a retractable USB-C cable built into the body, so a phone can be charged without carrying a separate lead.
Expert pick · TechRadar, Oct 2025
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We have not tested it ourselves: strengths and weaknesses below come from the tests cited.
Why Railfans Carry It
A day of photographing and following trains runs a phone down: the camera, the timetable and tracking apps and the map all draw on the same battery. A power bank with its own cable removes one more thing to untangle from a camera bag. TechRadar's reviewer calls the integrated cable a massive plus, notes that it locks at whatever length you pull it to, and says the unit is compact enough for a pocket or a small bag.
In the Field
In TechRadar's hands-on test, a Galaxy S24 FE with a 4,700 mAh battery went from empty to full in about 80 minutes with fast charging active. The reviewer also reports that the cord can be adjusted to fit onto a backpack or a belt loop, and that the built-in display shows output from the cable and the other ports as well as battery temperature and health. The same test found that the unit can get a little warm when several ports are in use, though it never felt overly hot. Recharging the power bank itself was slower than hoped: input was throttled to about 19 W after roughly ten minutes, and a full charge took about two hours. The maker's page adds that when more than one output is in use the total is shared, down to 22.5 W.
Strengths and Weaknesses
Expert pick · TechRadar: TechRadar's reviewer found it a practical power bank with a convenient built-in cable and a useful display, and solid overall performance for phones, but not enough wattage for laptops or other power-hungry devices, with some thermal throttling and a recharge that could be faster. Read the review
Strengths
- Retractable USB-C cable built into the body, 2.3 ft per the maker
- Display shows power flow, temperature and battery health
- Solid overall performance for phones in the reviewer's tests
- Compact, 3.21 x 1.99 x 1.42 in and 0.51 lb per the maker
- Cable rated by the maker for 20,000 bends and pulls
Weaknesses
- 45 W maximum is not enough for laptops or other power-hungry devices
- Output can be reduced by thermal throttling
- Recharging the bank could be faster, with input throttled to about 19 W in the test
- Output is shared, 22.5 W in total, when several ports are used at once
Key Specifications
| Specification | Value |
|---|---|
| Ports | 1 USB-C, 1 USB-A, 1 built-in USB-C cable |
| Weight | 0.51 lb |
| Capacity | 10,000 mAh |
| Dimensions | 3.21 x 1.99 x 1.42 in |
| Model number | A1638 |
| Maximum input | 30 W |
| USB-A port output | 22.5 W maximum |
| Maximum output (USB-C port or cable) | 45 W |
Who It’s For
It suits someone who mainly needs to keep a phone and a pair of earbuds going through a day out and does not want to carry a separate cable. Anyone who wants to charge a laptop, or who expects the highest sustained output from a single bank, should look at a higher-wattage model.
Alternatives
TechRadar's own reviewer points to the Anker 20,000 mAh 87 W Power Bank for power-hungry phones and some laptops. The same test names the Samsung 25 W 10,000 mAh Wireless Battery Pack as a cheaper rival, with considerably lower wattage.
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