Anker Nano Power Bank 10,000mAh Review: The Cable Is the Point
A pocket power bank with its own USB-C cable sewn in, a small colour screen and a 30 W headline. Two independent bench tests measured what it really delivers, and more than a thousand buyers have had their say. The capacity holds up better than the usual rule of thumb. The question the testers kept coming back to is whether that cable, which doubles as a carry loop, will last.
Where the reviews line up
The evidence comes from three places: a lab-style review at Trusted Reviews, a German specialist bench test at Techtest.org, and 1,114 buyer ratings at Best Buy in the US, where the same A1259 model is sold. On the basics, they agree.
Usable capacity is good for its size. The cells are rated at 36 Wh. Trusted Reviews got 27.9 Wh out of it (76.9%). Techtest measured 28.6–30.4 Wh (79–85%). Both beat the “expect 60–70%” rule of thumb you will see repeated online. It fast-charges an iPhone: Trusted Reviews measured about 24 W into an iPhone, and Techtest reported an iPhone 15 Pro Max and a Pixel 7 Pro both charging quickly. It refills fairly fast, in roughly 1½ hours from flat: 91 minutes for one tester, 1 hour 38 for the other.
The disagreement is over the cable. Anker loops it into a carry handle. Trusted Reviews calls that “not sensible” and says it “can't see how this could possibly end well”. We found no pattern of owners reporting broken cables, but we also found no long-term test, so nobody has actually answered the question. Two smaller points. Trusted Reviews found Android fast charging less dependable than iPhone charging. Techtest saw the output throttle back as the bank heated up under a sustained 30 W load.
Our view of the evidence: at around £30–£40 it is a well-made 10,000mAh bank that does what it claims. Buy it if not having to carry a separate cable matters to you. If you would rather have a cable you can replace, the cheaper option is a plain power bank and a £5 lead.
The three reviews this summary is built from
- Trusted ReviewsUK editorial test with measured input, output and efficiency. The cable sceptic.
- Techtest.orgGerman specialist bench test: capacity across several loads, PPS ranges and heat behaviour.
- Best Buy buyers4.24/5 from 1,114 ratings for the same A1259, checked 6 Oct 2026. US retailer.
Before the review: which Anker Nano?
Anker sells several power banks called “Nano”. This page is about the A1259: 10,000mAh, 30 W, with a short fixed USB-C cable that forms a loop, plus a USB-C port and a USB-A port. On 6 October 2026 Anker UK listed it at £39.99 and in stock. Anker also now sells a newer A1638 (10K, 45 W) with a retractable cable, along with 5,000mAh and 20,000mAh Nanos. Several of the videos you will find are about those other models, so check the model code before you buy.
Specification at a glance
| Spec | Figure | Confidence |
|---|---|---|
| Rated capacity | 10,000mAh / 36 Wh (cell rating) | mAh from Anker; the 36 Wh figure is from Techtest, as Anker's UK page gives no Wh |
| Usable energy, measured | 27.9 Wh (Trusted Reviews) · 28.6–30.4 Wh (Techtest) | Two independent tests, 77–85% of rated |
| Output | Built-in USB-C cable and USB-C port 30 W max; USB-A 22.5 W max; 24 W total with two devices | Anker spec sheet as reproduced by a UK retailer |
| Fast-charge standards | USB Power Delivery; PPS 3.3–11 V at up to 2.7 A; Quick Charge 3.0 on USB-A | Techtest measurement |
| Measured into an iPhone | About 24 W | Trusted Reviews |
| Input | 30 W max via the cable or the USB-C port | Anker |
| Recharge time | 50% in 45 min (Anker) · 91 min full (Trusted Reviews) · 1 h 38 min full (Techtest) | Needs a 30 W USB-C charger, not supplied |
| Pass-through charging | Not stated by Anker or either tester | See “What we could not check” |
| Weight | 215 g (Anker UK) · 216 g (Anker's Soundcore UK page) · 213 g measured (Techtest) | All within 3 g |
| Size | 104 × 52.3 × 26 mm | Anker |
| Flying | 36 Wh is well under the 100 Wh cabin limit. Hand luggage only | Our reading of the 100 Wh rule; check your airline |
| Guarantee | 24 months (Soundcore UK page and retailer spec sheet); Anker UK page says “Hassle-Free Warranty” with no length | No 18-month figure found for this model |
| Price | £39.99 at Anker UK; £43.19 at We Are Sync; seen at £29.99 at Amazon via Latest Deals | Checked 6 Oct 2026; the Amazon deal is undated |
Trusted Reviews
This is the most useful UK test because it measured the numbers instead of repeating them. Filling the bank took 36.28 Wh from the wall, the equivalent of 9,805mAh. Draining it delivered 27.9 Wh, or 76.9% efficiency (7,540mAh at the cell's voltage). That is a respectable result. It is the figure to work from, not the 10,000 on the box. A full recharge from flat took 91 minutes.
On speed, an iPhone pulled about 24 W rather than the headline 30 W. That is normal, because the phone decides how much it takes. The reviewer found Android fast charging more temperamental, depending on the adapter in use. The design gets warm praise for the “slick integrated display” and for being “cuter and classier than the average power bank”. The firm criticism is the cable-as-handle. The reviewer notes it is reinforced at both ends, but argues that hanging the bank's weight from its charging lead is asking for trouble. The verdict: “a likeable pick”, though “not quite as impressive on the technical side”. At the time of the review it was priced at £34.
Watch: Anker Nano Power Bank, 10,000mAh with Built-In USB-C Cable, PD 30W Output TESTING WITH IPHONE 15 PRO
An iPhone charging test of the same 30W model. It is the closest match to Trusted Reviews' iPhone finding.
Watch on YouTube ↗Techtest.org
Techtest is an enthusiast site that tests power banks with electronic loads and USB meters, and it publishes the raw numbers. It measured 28.6–30.4 Wh usable (7,936–8,454mAh), depending on the load. That is 79–85% of the 36 Wh rating, a little better than Trusted Reviews found. The difference is down to test method, and both figures are honest. Both clearly beat the “60–70%” rule of thumb. So for this bank, assume you will get roughly three-quarters to four-fifths of the rated energy, not two-thirds.
The test also confirms the detail Android owners need. The USB-C outputs support PPS from 3.3 to 11 V at up to 2.7 A, which is the standard Samsung's Super Fast Charging uses. An iPhone 15 Pro Max and a Pixel 7 Pro both charged quickly. It weighed 213 g on Techtest's scales. A full recharge took about 1 hour 38 minutes on a 30 W charger. The one technical concern was heat: under a sustained 30 W load the bank throttles back. That matters if you hoped to run a laptop from it, and much less for a phone. Techtest liked the cable more than Trusted Reviews did and found it comfortably long. Its verdict: recommended for everyday use despite the price premium.
Watch: Test: Anker Nano Powerbank 10.000mAh Powerbank mit eingebautem USB-C Kabel und 30W
The title matches Techtest's written review word for word, so this appears to be its companion video. It is in German.
Watch on YouTube ↗Best Buy buyers
UK retailer pages for this model either block automated checks or show no rating count. The biggest buyer sample we could actually read was in the US, at Best Buy: 4.24 out of 5 from 1,114 ratings. That is a solid but not glowing score for a mainstream power bank. These are US buyers on a US listing, but the hardware is the same A1259. For comparison, Anker's own UK page shows 386 reviews, and Verizon's US page shows 4.6/5 from just 25. Both are pages that sell the product, and the Verizon sample is too small to lean on.
The page summary we could read did not break down the complaints. In the comments we could see, from Verizon and the UK deal forum Latest Deals, the praise is generic: “great battery”, “lighting fast”, “good quality”. We did not find a cluster of reports of the built-in cable failing. That is mildly reassuring, but it is not proof. Most ratings come in within weeks of purchase, while a fraying cable is a problem that shows up after a year in a bag.
Watch: Fast Portable 30 Watt Charging: Anker Nano Power Bank with Built in USB C Cable Review
An owner-style review of the 30W built-in cable model. It is a good look at the size, the screen and the cable loop before you buy.
Watch on YouTube ↗Strengths and weak points
What holds up
- The cable is always there. For many people that is the whole reason to buy it.
- Measured usable energy of 27.9–30.4 Wh, 77–85% of rated, in two independent tests.
- Charges an iPhone at about 24 W, and supports PPS for Samsung-style fast charging.
- Three outputs: the cable, a USB-C port and a USB-A port, so it can charge two devices at once.
- Refills in about 1½ hours on a 30 W charger, through the cable or the port.
- The colour screen shows the remaining charge, which testers liked.
- At 36 Wh it is far below the 100 Wh airline cabin limit.
What people complain about
- The built-in cable doubles as a carry handle. Trusted Reviews thinks that is a design mistake.
- If the cable fails, you cannot replace it. The bank still works through its other ports.
- Total output drops to 24 W when two devices are connected.
- Throttles under a sustained 30 W load, so it is not a laptop bank.
- Android fast charging was temperamental in one test.
- At 215 g it is heavier than the slimmest 10,000mAh banks. No charger in the box.
Who it actually suits
Buy it if you carry a USB-C phone and keep finding yourself with a power bank but no lead. It suits a day out, a festival or a flight. It goes in a hip-belt pocket or a daypack lid, the screen tells you what is left, and 36 Wh gets through airport security without a second thought. With 28–30 Wh actually delivered, it is roughly enough for one to two full charges of most current phones. That estimate is ours, and it depends on your phone's battery size.
Look elsewhere if you treat kit roughly and want every part to be replaceable. A plain power bank and a separate cable will outlast a cable you cannot swap. Look elsewhere too if you want to charge a laptop, where 30 W with throttling is too little, or if your phone still uses Lightning, because then you will be carrying an adapter anyway. If a longer cable appeals, Anker's newer 45 W A1638 has a retractable one. We have not covered that model.
Heading out for the day? Read our Osprey Talon 22 review for something to carry it in, our Hydro Flask 32oz review for the other thing in the side pocket, and our Garmin Venu 4 and Fitbit Charge 6 reviews if you are wondering whether a bank this size will top up a watch. It will, through the USB-A or USB-C port with the watch's own lead.
What we could not check
- Pass-through charging. Anker's UK and US pages, the spec sheet and both bench tests are silent on whether the bank can charge a phone while it is itself on charge. Best Buy's listing mentions charging devices and recharging the bank, but does not clearly say both can happen at once. Do not count on it.
- Long-term cable durability. No source tested it, and we found no published bend-test figure for this model's cable. We saw no cluster of failure reports, but buyer ratings mostly come in within weeks of purchase.
- Who coined the “60–70% usable” rule. It is widely repeated, but we could not trace it to a test. For this model, the two measured results (77% and 79–85%) are what we have relied on.
- Guarantee length on Anker UK's own page. Anker UK's page says “Hassle-Free Warranty” without a length. The 24 months comes from Anker's Soundcore UK page and a retailer spec sheet. We found no 18-month figure for this model.
- UK buyer ratings with a sample size. Amazon blocks automated checks, and other UK retailer pages showed no usable count. Latest Deals displays 4.6 from 589, but we could not tell what that rating covers, so we have not relied on it.
- Trusted Reviews' publication date and reviewer name did not come through on our check.
- Airline rules. The 100 Wh limit and the 2026 tightening (a maximum of two power banks, no charging in flight) come from a travel-industry summary of ICAO guidance, not the regulator's own text. Check your airline before you fly.
- The videos were confirmed by their exact watch URLs and titles appearing in two separate search listings, not by opening them. None of the three listings named its channel.
Sources last checked 6 October 2026. Power bank prices move weekly. Check the model code (A1259) and the price on the listing in front of you before you order.