Anker Nano 10K 30W (A1259)

Why this one

Recommended by Android Central and supported by exact-model Techtest and techAU use. It is much lighter than the larger shortlisted banks, with a built-in cable and enough measured output for about two reference-phone charges.

Specifications and sources

Cell capacity: 10,000 mAh; maker page does not give a Wh figure
USB-C input: Up to 30 W; 5/9 V at 3 A, 15 V at 2 A, 20 V at 1.5 A
USB-C output: Up to 30 W; 5/9 V at 3 A, 12 V at 2.5 A, 15 V at 2 A, 20 V at 1.5 A
Cable and indication: Built-in USB-C cable and battery display
Shared output: 24 W maximum across multiple connections

What independent testers found

Techtest, Michael Barton

Measured 30.434 Wh at 5 V/1 A from a 213 g sample. That supports an estimated 2.16 charges of a reference 12 Wh phone after the site's phone-loss allowance; sustained maximum output caused heat-related interruptions.

Techtest, Michael Barton test ↗, checked 2026-10-29

techAU, Neerav Bhatt

Several weeks of Pixel 8 Pro use showed convenient pocket charging with the built-in cable. The reviewer found the screen hard to read in bright sunshine and worried about the exposed cable snagging.

techAU, Neerav Bhatt test ↗, checked 2026-10-29

What owners report

Best Buy owners repeatedly like the built-in cable and portable size, but report widely differing numbers of phone charges; many reviews are incentivised. An owner who identifies A1259 reports an iPhone 15 Pro charging-direction problem, which is an isolated compatibility report.

Limits and cautions

The tester records 36 Wh, slightly below the 37 Wh guide. The maker page gives mAh only; no nominal voltage has been assumed.
The two-charge estimate uses a 12 Wh reference battery, not two observed cycles of a named phone. Larger phones and use while charging reduce it.
This is the A1259 with a fixed cable, not the newer retractable Nano. Lightning phones require a separate compatible cable.
Treat 30 W as a maximum, not sustained laptop power. The built-in cable can snag; separate USB-C and USB-A ports remain available.
Public model-specific conformity and detailed protection documentation were not verified. Euronics states a 24-month warranty and provides an Irish returns route.

See it in use

Play independent test by Adam Talks Tech

Play video by Adam Talks Tech (loads YouTube)

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