Anker Nano Magnetic Power Bank 5,000mAh Qi2

Heat and real wireless speed

Anker rates the magnetic pad at up to 15W under Qi2, with 5W and 7.5W modes, and claims the rear casing stays below 104°F (40°C) using a graphene spreader and dual NTC sensors. In practice Macworld found the slim pack warms up and throttles: on an iPhone 15 it delivered only 22% to 32% in 30 minutes, and an independent r/anker test saw wired power fall from about 20W to about 15W after about 30 minutes. The phone’s own heat matters too, so one Best Buy owner reported an iPhone 17 Pro getting hot enough to remove mid-charge while others saw only mild warmth. None of this is a proven defect, just the cost of a very thin body.

What 5,000 mAh actually delivers

The label says 5,000 mAh, but Anker estimates only 2,750–3,500 mAh of delivered charge after conversion losses and warns not to expect a full phone charge. Macworld’s test charged a drained iPhone 16 Pro to 77% from one full bank, which is a realistic target for a pocket top-up. For speed, the USB-C port runs at up to about 20W; Macworld pushed 20W-class charging into an iPad Pro and a MacBook Air M3, though the small cell gives very little laptop runtime. Running wired and wireless together drops to a shared 12W wired plus 5W wireless.

Parts, upkeep and running costs

There is no subscription, filter or scheduled part, so the only running cost is charging electricity. Using a 20Wh battery figure and a rough 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 $0.20/kWh; none of those are measured household averages. The 5,000 mAh cell is sealed, and Anker publishes no replacement battery, port or part number, so a failure means warranty or a new unit rather than a repair.

Warranty, returns and recalls

Anker lists 24 months for MagGo power banks and runs a direct online claim process; its store advertises 30-day money-back returns, while a retailer’s policy is separate. Battery aging is not covered. The 2025 US CPSC recall and Anker’s own recall list cover models A1647, A1652, A1257, A1681 and A1689, not the A1665, so check the underside model number before applying any recall advice.

Is it worth it?

Anker’s own store and Best Buy both list the black A1665 at $54.99 (Anker, Best Buy, October 2026), and Walmart and Newegg show $59.99. At $40 or below for a new, authorized unit it is excellent if pocket thinness matters, $41–49 is attractive with a credible seller, and $50–55 is the usual premium for slimness. Above $60, skip the markup and compare 10K models for more endurance. The ESR Qi2 5K MagSlim Kickstand is $42.99 with a built-in stand but a thicker body.

Which model this is

This page covers the Anker Nano Power Bank (5K, MagGo, Slim), model A1665, in the black single-unit retail version that Best Buy lists as SKU 10317528. Do not confuse it with the older, thinner A1667 sold through Apple, whose heat and case complaints do not describe this pack.

Sources

Manufacturer:

• Anker A1665 official product page
• Anker A1665 product FAQ
• Anker A1665 user manual
• Anker warranty and refund policy
• Anker product recall list

Independent reviews:

• Macworld: Anker Nano 5K MagGo Slim tested
• Macwelt: Anker Nano 5K MagGo Slim tested
• US CPSC: 2025 Anker power bank recall

Owner reports:

• r/anker: independent A1665 capacity and charging test
• r/MagSafe: A1665 vs older A1667 identity discussion
• r/MagSafe: thin Anker Nano thermal experiences

Parts and stores:

• Best Buy A1665 listing
• ESR 5K Qi2 MagSlim Kickstand
• Belkin BoostCharge Pro Qi2 5K