Anker Nano Power Bank A1638, 10,000mAh, 45W

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Product guide

Anker Nano Power Bank A1638, 10,000mAh, 45W

The Anker Nano Power Bank A1638 is a compact 10,000mAh portable charger with a built-in retractable USB-C cable and a claimed 45W maximum single-port output. Its three-port listing and reduced output when multiple ports are used make it better suited to charging a phone than sustaining laptop power.

At a glance

Built-in retractable USB-C cable reduces the need to pack a separate charging lead for compatible devices.
The claimed 45W maximum applies to single-port use. Listing details state output falls to 15W maximum with two ports, or 7.5W per port with three.
A smart display and pass-through charging are claimed in the listing features.
The listing says a 30W or higher Power Delivery adapter is recommended for optimal recharging.

Price

£39.99Save 20%

Reference price: ~~£49.99~~

Price checked: 12 Nov 2026

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Often bought together

Khanka Hard Case for Anker Nano Power Bank,10,000mAh 45W(A1638) | Storage Travel Cover for Anker Nano 45W Max Compact Battery Pack;EVA shell,Velvet Interior,Green,Case Only

£15.99

Pros and cons

Pros

Integrated retractable cable makes quick phone top-ups simpler when you do not want to carry a separate USB-C lead.
Compact listed dimensions and a display make it practical for pocket or travel use, according to customer feedback and listing details.
The claimed 45W single-port output supports faster charging for compatible phones, though actual rates depend on the device.

Cons

The 10,000mAh capacity is a phone-top-up format rather than a good fit for sustained laptop charging. The listing itself does not recommend it for routine laptop use.
Output is substantially limited when charging through multiple ports, so it cannot maintain the single-port maximum across several connected devices.
The claimed battery capacity is not all available as device-side power. The listing estimates 5,500mAh to 6,500mAh usable after conversion losses.

Technical specifications

19 specifications

Identity
Brand	Anker
Model	A1638
Colour	Blue
Compatible device	Smartphone

Power and battery
Capacity	10000 Milliamp Hours
Maximum output wattage	45 Watts
Voltage	5 Volts
Amperage	3 Amps
Power configuration	Corded Electric
Battery cell type	Lithium Polymer
Battery charge time	2 Hours
Battery weight	144 Grams

Connections and features
Connector type	USB Type C
Number of ports	3
Built-in cable	Built In Cable
Portable	Yes
Cordless	No

Dimensions and installation
Dimensions listed	8.2 x 3.6 x 5.1 centimetres
Weight listed	231 Grams

What to know before buying

The listing claims the power bank can recharge in 2 hours and elsewhere specifies a 30W maximum input. It recommends a 30W or higher PD adapter for optimal recharging.
To charge iPhone 14 series and earlier, the listing says a USB-C to Lightning cable is needed and is not included.
The listing estimates 5,500mAh to 6,500mAh of usable power from its stated 10,000mAh capacity because of conversion losses.
A connected phone may draw less than the 45W maximum, depending on its accepted charging rate and temperature.

Listing details to confirm

Listing details are inconsistent about the dimensions and weight: the details table gives 8.2 x 3.6 x 5.1 centimetres and 231 Grams, while feature text gives 81.5 x 50.5 x 36.1 mm and 232 g. The claimed 45W maximum also contrasts with a feature statement that the USB-C port and included cable support 40W fast charging for named phones. Confirm which figures and output apply to the selected version. The listing says 45W is a single-port maximum, multiple-port use reduces output, and laptop charging is not recommended for sustained use.

Who is it for?

A good fit for

Phone owners who want a pocketable backup battery with an attached USB-C cable for compatible devices.
Travellers who prioritise a built-in cable and quick single-device charging over charging several devices at high speed.
Buyers who want a screen showing charging information and can accept the listed weight and capacity trade-offs.

Less suited to

People seeking a power bank for sustained laptop charging or substantial laptop use.
Anyone who needs high output while charging two or three devices at once.
Buyers who need a guaranteed specific charging speed across all phone models or a stated usable capacity equal to 10,000mAh.

Anker Nano Power Bank A1638, 10,000mAh, 45W · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.5 / 5 · 3,820 ratings

5 stars79%79%
4 stars11%11%
3 stars3%3%
2 stars2%2%
1 star5%5%

Customer feedback highlights the built-in display, compact size, portability and retractable cable as useful for on-the-go phone charging. Some customers describe the weight as light, while others find it heavier than expected. That trade-off matters for a pocketable 10,000mAh bank listed at about 231–232 g. The reported positive charging experiences do not establish a particular speed or number of device charges, which depend on the phone and usage.

Positive themes

Customers report appreciating the display, compact size, portability and retractable cable.

Mixed feedback

Feedback on weight is mixed, with some finding it light and others heavier than expected.

Frequently asked questions

Does the Anker Nano A1638 provide 45W charging?

The listing claims up to 45W from a single port. It also says output is limited to 15W maximum when two ports are used and 7.5W per port with three. A feature statement separately names 40W fast charging for certain phones, so check the applicable output for your device and version.

Can it charge a laptop?

The listing says laptop charging is not recommended for regular use because the 10,000mAh capacity and heat during high-power output do not sustain 45W for long. It describes emergency top-ups as the more suitable use.

Is a charging cable included?

A retractable USB-C cable is claimed as built in. The listing says a separate USB-C to Lightning cable is required for iPhone 14 series and earlier, and that cable is not included.

How much of the 10,000mAh capacity can be used?

The listing estimates about 5,500mAh to 6,500mAh of usable power after battery and circuit conversion losses. Actual charging results vary with the connected device.