For a compact device kit with its cable built in
The retractable cable and separate USB-C port each support up to 45W individually. Three output choices give flexibility, but the 22.5W total limit applies when multiple outputs are active.
Anker · United States · compact
Anker Nano Power Bank (10K, 45W, Built-In Retractable USB-C Cable) review
Exact model: A1638 · Revision: US A1638 retail model with retractable USB-C cable
Product identity · checked 2026-10-07
Manufacturer product image · source
A 10,000mAh, 36Wh compact bank with a retractable USB-C cable, a USB-C port and USB-A. Either individual USB-C path is rated up to 45W, while multi-port use shares output down to a 22.5W total maximum.
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Availability checked 2026-10-07. Stock can change.
Manufacturer product image · source
- Rated capacity
10000 mAhclaimed. Show source
claimed sourceanker.com ↗checked 2026-10-07 · Manufacturer-rated capacity- Single-port output
45 Wclaimed. Show source
claimed sourceanker.com ↗checked 2026-10-07 · Strongest wired USB-C output from one port · Maximum from either one USB-C port or the built-in USB-C cable when used individually.- USB-C input
30 Wclaimed. Show source
claimed sourceservice.anker.com ↗checked 2026-10-07 · Strongest standard single-port USB-C input · Maximum standard USB-C input; output is rated separately.- Weight
231.3 gclaimed. Show source
claimed sourceanker.com ↗checked 2026-10-07 · Manufacturer-listed product weight · Converted from Anker’s listed 0.51 lb.- Combined output
22.5 Wclaimed. Show source
claimed sourceanker.com ↗checked 2026-10-07 · Combined output; not one-port output · Shared maximum when multiple outputs are used; a single USB-C output is rated 45W.
BatteryRank review
Our verdict
Best suited to a phone, tablet or lower-draw USB-C device when built-in cable convenience matters. Although the individual 45W USB-C rating can serve some smaller laptops, the 10,000mAh capacity label and multi-port sharing make it a smaller reserve than the laptop-class models.
Ratings below are manufacturer-claimed. Open a reading to see its source and check date; derived comparisons are identified separately.
Use and carrying fit
Where it fits
What changes the choice
Tradeoffs
Multi-port use sharply lowers the shared ceiling
One USB-C path can reach 45W; Anker rates cable plus USB-C port together at up to 22.5W, and all three outputs together at up to 22.5W. The per-port peak should not be read as simultaneous output.
The input ceiling is below its output peak
Anker lists up to 30W input for recharging the bank and up to 45W output from an individual USB-C path. Those are separate directions and ratings.
Before connecting devices
Ports and charging behavior
A port’s published maximum and the combined multi-port limit are separate ratings. A device can draw less than the bank’s maximum based on its own requirements and the negotiated charging profile.
Recharge over USB-C at up to 30W
The A1638 FAQ specifies up to 30W input. For connected devices, Anker rates either USB-C output path individually at up to 45W; the active-port count changes the available shared output.
Documented ports
Built-in retractable USB-C cable · built-in-usb-c
Anker Nano Power Bank (10K, 45W, Built-In Retractable USB-C Cable), US product specifications · checked 2026-10-0745 W maxclaimed. Show source
claimed sourceanker.com ↗checked 2026-10-07 · Maximum manufacturer rating for this portUSB-C port · USB-C
Anker Nano Power Bank (10K, 45W, Built-In Retractable USB-C Cable), US product specifications · checked 2026-10-0745 W maxclaimed. Show source
claimed sourceanker.com ↗checked 2026-10-07 · Maximum manufacturer rating for this portUSB-A port · USB-A
Anker Nano Power Bank (10K, 45W, Built-In Retractable USB-C Cable), US product specifications · checked 2026-10-0722.5 W maxclaimed. Show source
claimed sourceanker.com ↗checked 2026-10-07 · Maximum manufacturer rating for this port
Manufacturer documentation
Specifications
Manufacturer claims link to the dated source used for this exact revision. Watt-hours appear only when the OEM states them explicitly; we do not infer energy from milliamp-hours.
- Rated capacity
10000 mAhclaimed. Show source
claimed sourceanker.com ↗checked 2026-10-07 · Manufacturer-rated capacity- Rated energy
36 Whclaimed. Show source
claimed sourceservice.anker.com ↗checked 2026-10-07 · Only an explicit manufacturer watt-hour figure is shown- Strongest single USB-C output
45 Wclaimed. Show source
claimed sourceanker.com ↗checked 2026-10-07 · Maximum rating for one wired USB-C port- Combined output ceiling
22.5 Wclaimed. Show source
claimed sourceanker.com ↗checked 2026-10-07 · Combined multi-port maximum; distinct from one-port output- Strongest standard USB-C input
30 Wclaimed. Show source
claimed sourceservice.anker.com ↗checked 2026-10-07 · Single standard USB-C input; proprietary dock excluded- Weight
231.3 gclaimed. Show source
claimed sourceanker.com ↗checked 2026-10-07 · Manufacturer-listed product weight- Dimensions
3.21 × 1.99 × 1.42 inclaimed. Show source
claimed sourceanker.com ↗checked 2026-10-07 · Manufacturer-listed dimensions- Built-in retractable USB-C cable
45 W maxclaimed. Show source
claimed sourceanker.com ↗checked 2026-10-07 · Maximum manufacturer rating for built-in-usb-c- USB-C port
45 W maxclaimed. Show source
claimed sourceanker.com ↗checked 2026-10-07 · Maximum manufacturer rating for USB-C- USB-A port
22.5 W maxclaimed. Show source
claimed sourceanker.com ↗checked 2026-10-07 · Maximum manufacturer rating for USB-A
Exact-model questions
Frequently asked questions
Can the cable and USB-C port both deliver 45W at once?
No. Anker rates either path individually at up to 45W, but cable and USB-C port together share up to 22.5W total. With all three output paths in use, the published total is also up to 22.5W.
What is its explicitly rated energy?
Anker’s product FAQ lists 36Wh for A1638. We use that stated rating rather than deriving watt-hours from the capacity label.
Evidence record
Sources
We use manufacturer documentation for the product identity and claims shown on this review.
- Anker Nano Power Bank (10K, 45W, Built-In Retractable USB-C Cable), US product specifications
Checked 2026-10-07
- Anker Nano Power Bank (10K, 45W), A1638 official FAQ
Checked 2026-10-07
- Anker Nano A1638 product image
Checked 2026-10-07
Compare this model
Review updated 2026-10-07. Ratings are manufacturer claims tied to the cited documents.