Anker Nano Power Bank (5K, MagGo, Slim) A1665: problems, parts and running costs

Checked: 2026-10-20

Summary

The main thing that goes wrong is heat: the very thin 0.34 in body warms up and throttles, so 15W wireless charging often delivers far less in real use. [3][6] There are no consumables, so the only running cost is charging electricity, roughly $1.83 a year at a hypothetical $0.20/kWh. [6] It is a good buy at $40 or below for a new, authorized unit and attractive from $41 to $49. [1]

Common problems and fixes

Wireless charging throttles when warm — Macworld’s iPhone 15 test saw only 22% to 32% added in 30 minutes, and an independent r/anker test saw wired power fall from about 20W to about 15W after about 30 minutes; keep the pack and phone cool and out of direct sun, or use the wired port when speed matters. [3][6]
5,000 mAh will not fully recharge a large phone — Anker estimates 2,750 to 3,500 mAh of delivered charge after conversion losses, and Macworld charged a drained iPhone 16 Pro to 77% from one full bank; treat it as an emergency top-up, not a full refill. [1][3]
Phone gets hot enough to stop charging — a Best Buy owner reported an iPhone 17 Pro getting hot enough to remove the pack mid-charge, while others saw only mild warmth; if it is unusually hot, stop charging and let both devices cool before reuse. [9]
Magnetic hold is weak with some cases — a Best Buy owner found attachment adequate but wished it were stronger on an iPhone 15 Pro with an Apple MagSafe case; Anker advises MagSafe-compatible cases no thicker than 2.5 mm and proper alignment. [2][9]
Simultaneous wired and wireless output is capped — the shared limit is 12W wired plus 5W wireless, not 20W plus 15W, so do not expect both at full speed at the same time. [1][7]
Phone pauses or shows “Slow Charger” — Anker says these can be iOS thermal and battery-protection behavior rather than proof the bank is broken; move to a cooler place and avoid heavy phone use while charging. [1][5]
No kickstand, no built-in cable, four coarse LEDs — the slim enclosure has no stand and no integrated lead, and the four-LED indicator gives roughly quarter-step feedback instead of a percentage readout. [1][7]
Battery aging is not covered — Anker’s 24-month MagGo warranty covers manufacturing defects but not normal capacity loss, so a worn cell is a replacement, not a repair. [8]

Parts and consumables

USB-C-to-USB-C cable — one is included and it is an ordinary nonproprietary cable; Anker recommends a 3A compatible cable for top refill performance, and a separate cable can be bought if it wears out. [1][7]
20W USB-C wall adapter — not included in the box; Anker advises a USB-C PD supply rated 20W or higher for faster refilling. [1][8]
No filters, cartridges, subscriptions or scheduled refills — the only scheduled expense is electricity. [1]

Yearly running cost

Electricity only. Using a hypothetical 20Wh battery energy and 80% wall-to-stored efficiency, one full charge a day draws about 25Wh, or 9.125 kWh a year, which is about $1.83 at an assumed $0.20/kWh. [6] There are no filters, subscriptions, pods or scheduled parts, and Anker publishes no model-specific battery part or replacement price. [1][8]

When it is a good buy

Anker’s US store listed the black A1665 at $54.99 in October 2026. [1]
Best Buy listed the black A1665 (SKU 10317528) at $54.99 in October 2026, with an advertised $59.99 comparison value; a separate indexed review page showed $49.49, so the offer is time and route dependent. [2][9]
Walmart and Newegg showed $59.99 for the A1665 in October 2026. [15][16]
PayMore Chelsea listed a new A1665 with original box at $49.99; seller warranty authorization should be confirmed before relying on the 24-month cover. [17]
At $40 or below for a new, authorized unit it is excellent if pocket thinness matters; $41 to $49 is attractive with a credible seller; $50 to $55 is the usual premium for slimness; above $60 skip the markup and compare 10K models for more endurance. [1]
ESR Qi2 5,000mAh MagSlim Kickstand, black — $42.99 on ESR’s catalog — the better choice when a built-in stand and lower asking price matter more than maximum thinness. [13]
Belkin BoostCharge Pro Qi2 15W 5,000mAh, BPD006btBK — $59.99 at Belkin — the better choice when a sturdy built-in stand and comparable 15W Qi2 charging matter. [14]
Anker MagGo 10K Slim Qi2 15W — $79.86 at Walmart — the better choice when long-trip reserve and nearly double nominal capacity matter more than the A1665’s very thin profile. [20]