For a slim magnetic phone backup
The built-in USB-C cable supports up to 20W input and output, while Qi2 wireless output is rated up to 15W. The small capacity label and 122g weight favor a lightweight top-up role over replacing a larger bank.
Anker · United States · compact
Anker Nano Power Bank (5K, MagGo Slim) review
Exact model: A1665 · Revision: US A1665 Qi2 magnetic slim model
Product identity · checked 2026-10-07
Manufacturer product image · source
A very slim 5,000mAh magnetic power bank with up to 15W Qi2 wireless output and 20W input/output over its USB-C cable. At 122g and 8.6mm thick, it prioritizes a light phone top-up kit over a large reserve.
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Availability checked 2026-10-07. Stock can change.
Manufacturer product image · source
- Rated capacity
5000 mAhclaimed. Show source
claimed sourceanker.com ↗checked 2026-10-07 · Manufacturer-rated capacity- Single-port output
20 Wclaimed. Show source
claimed sourceservice.anker.com ↗checked 2026-10-07 · Strongest wired USB-C output from one port · Maximum wired USB-C output from the cable; Qi2 wireless output is rated separately.- USB-C input
20 Wclaimed. Show source
claimed sourceservice.anker.com ↗checked 2026-10-07 · Strongest standard single-port USB-C input · USB-C cable input; this is the exact-model guide rating, not the ambiguous total-output row.- Weight
122 gclaimed. Show source
claimed sourceanker.com ↗checked 2026-10-07 · Manufacturer-listed product weight
BatteryRank review
Our verdict
A carry-first option for a compatible magnetic phone when a slim attached backup matters more than all-day capacity. Its 5,000mAh label is half the common 10K compact class, and magnetic compatibility is specific to phone and case.
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
Slimness comes with a smaller reserve
The A1665 is labeled 5,000mAh, compared with 10,000mAh models in this compact group. Recharge count varies by phone, load and conversion, so the capacity labels alone do not promise a fixed number of charges.
Check magnetic compatibility before choosing wireless
Anker describes Qi2/MagGo support for compatible phones and cases and lists exclusions for some smaller or older iPhone models and cases that interfere with alignment. The USB-C cable is an alternative path.
A summary row is not a clear multi-port mode
The US product page includes a low “Total Output” row but does not clearly define the operating condition. The model-specific guide confirms 20W wired cable input/output and 15W wireless output; we omit a combined-output figure.
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.
Wired and wireless are separate limits
The exact A1665 guide specifies 20W input/output through the USB-C cable and 15W Qi2 wireless output. Those values describe different paths and should not be added together.
Documented ports
USB-C cable · built-in-usb-c
OEM profiles: 5V⎓3A / 9V⎓2.22A
Anker Nano Power Bank (5K, MagGo Slim), A1665 model guide · checked 2026-10-0720 W maxclaimed. Show source
claimed sourceservice.anker.com ↗checked 2026-10-07 · Maximum manufacturer rating for this portQi2 wireless · wireless
Anker Nano Power Bank (5K, MagGo Slim), A1665 model guide · checked 2026-10-0715 W maxclaimed. Show source
claimed sourceservice.anker.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
5000 mAhclaimed. Show source
claimed sourceanker.com ↗checked 2026-10-07 · Manufacturer-rated capacity- Strongest single USB-C output
20 Wclaimed. Show source
claimed sourceservice.anker.com ↗checked 2026-10-07 · Maximum rating for one wired USB-C port- Strongest standard USB-C input
20 Wclaimed. Show source
claimed sourceservice.anker.com ↗checked 2026-10-07 · Single standard USB-C input; proprietary dock excluded- Weight
122 gclaimed. Show source
claimed sourceanker.com ↗checked 2026-10-07 · Manufacturer-listed product weight- Dimensions
102 × 70.6 × 8.6 mmclaimed. Show source
claimed sourceanker.com ↗checked 2026-10-07 · Manufacturer-listed dimensions- USB-C cable
20 W maxclaimed. Show source
claimed sourceservice.anker.com ↗checked 2026-10-07 · Maximum manufacturer rating for built-in-usb-c- Qi2 wireless
15 W maxclaimed. Show source
claimed sourceservice.anker.com ↗checked 2026-10-07 · Maximum manufacturer rating for wireless
Exact-model questions
Frequently asked questions
Can the USB-C cable output 20W?
Yes. Anker’s exact-model A1665 guide lists 20W input/output over the cable. Qi2 wireless output is separately rated up to 15W.
Will the magnetic charger fit every phone?
No. Anker lists compatible magnetic/Qi2 devices and calls out exceptions including some smaller or older iPhone models; case thickness and metal components can also affect alignment. Check the current compatibility list for the exact phone and case.
Evidence record
Sources
We use manufacturer documentation for the product identity and claims shown on this review.
- Anker Nano Power Bank (5K, MagGo Slim), US product specifications and compatibility
Checked 2026-10-07
- Anker Nano Power Bank (5K, MagGo Slim), A1665 model guide
Checked 2026-10-07
- Anker Nano Power Bank (5K, MagGo Slim), A1665 user guide
Checked 2026-10-07
- Anker Nano A1665 product image
Checked 2026-10-07
Compare this model
Review updated 2026-10-07. Ratings are manufacturer claims tied to the cited documents.