Xiaomi Squeezed 10,000mAh Into a 13.2mm Magnetic Power Bank. iPhone Owners Get the Short End

Xiaomi’s new magnetic power bank packs 10,000mAh into a 13.2mm aluminum body that weighs 195g and costs ¥399 ($59). You get 45W wired output and a battery log you can check over USB-C, but if you carry an iPhone, wireless charging stops at a slow 7.5W.

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Xiaomi just launched a 10,000mAh magnetic power bank that’s 13.2mm thick and weighs 195g, a third slimmer than its previous pack with the same capacity. Magnetic power banks are the battery packs that snap onto the back of your phone and charge it without a cable, and they’ve become one of the most popular phone accessories of the past few years. Here’s what the new model gets right, where it cuts corners, and who should buy one.

For context, Xiaomi says the new pack is 35% smaller, 43g lighter, and 6.6mm thinner than its earlier 10,000mAh magnetic model. That older design measured 19.8mm thick. Losing a third of the thickness is the difference between a pack that feels like a brick on your phone and one that feels like a thick case.

To understand why this matters, you need to know one thing about lithium batteries. When you charge one, lithium gets stored in a part called the anode. In most batteries, that anode is made of graphite, the same stuff in pencils.

Silicon can hold far more lithium than graphite for its weight. The problem is that it swells when it fills up, which can crack the battery over time. So manufacturers blend a small amount of silicon into a carbon structure. You get extra capacity without the swelling problem.

Xiaomi’s cells use 16% silicon and reach an energy density of 840Wh/L. Energy density simply means how much power fits into a given space. Higher density lets Xiaomi fit the same 10,000mAh into a much flatter body.

Phones adopted silicon-carbon first, which is why mid-range phones now ship with 7,000mAh to 10,000mAh batteries. Power banks are next, and we think every major accessory brand will follow within a year. It’s the obvious way to make packs thinner without cutting capacity.

Here’s the part the launch numbers gloss over. The 20W wireless speed only works with Xiaomi’s own phones, such as the Xiaomi 15 and 17 series. If you snap it onto an iPhone 17, iPhone 17 Pro, or iPhone Air, you get 7.5W.

That’s slow. At 7.5W, topping up a nearly empty iPhone wirelessly can take several hours. Compare that with Qi2, the open wireless charging standard Apple helped create, which supports faster magnetic charging on iPhones. Xiaomi’s own thicker 10,000mAh magnetic pack supports Qi2.2 at up to 25W, so the company clearly knows how to do it. It just didn’t do it here.

Our take: this is a power bank built for Xiaomi phone owners first. If you carry an iPhone, the 45W USB-C port is still useful because a cable charges far faster than the magnetic pad. But then you’re buying a magnetic power bank and mostly using it with a cable, which defeats the point.

The two-device limit is also worth knowing. You can charge your phone wirelessly and your earbuds over USB-C at the same time, but the total drops to 15W. That’s fine for earbuds, and slow for two phones.

The most forward-looking feature isn’t the thickness. It’s the battery information system. Plug the pack into a computer over USB-C, and it reports its temperature, voltage, manufacturing details, operating status, and a log of any abnormal activity.

That’s not a gimmick. China published a new mandatory safety standard for power banks, GB 47372-2026, with a 12-month transition before it takes effect on April 1, 2027. The rules push makers to track battery health closely and keep a record of faults that can be traced later, rather than just competing on charging speed.

The reason is safety. Power bank fires, especially on planes, have pushed regulators to demand more than a capacity sticker. Think of the log as a small black box for your battery. If a pack overheats, there’s a record of what happened.

Xiaomi says this model already meets the standard. It also adds an NTC chip (a sensor that tracks temperature), a graphene layer, and thermal silicone to spread heat. We expect this kind of battery logging to spread beyond China, because airlines and regulators everywhere have the same problem.

A 10,000mAh power bank doesn’t put 10,000mAh into your phone. Energy gets lost as heat when the pack converts its voltage, and wireless charging loses more than a cable does. As a rough rule, expect about two-thirds of the rated capacity to reach your phone over a cable, and a bit less wirelessly.

For most phones, that works out to roughly one to one-and-a-half full charges, depending on battery size. With 30W input, we estimate the pack itself refills in about 1.5 to 2 hours from empty.

The battery log helps here too. Power banks lose capacity as they age, and most give you no way to tell. Being able to read this pack’s health and fault history over USB-C means you can spot a tired or misbehaving battery before it lets you down on a trip.

It’s also comfortably under the 100Wh limit that most airlines use for carry-on batteries. Two 5,000mAh cells come to roughly 37Wh to 39Wh, based on standard lithium cell voltage.

For now, the pack is only on Xiaomi Youpin, the company’s crowdfunding and lifestyle store in China. Xiaomi does have a track record of taking its slim magnetic packs global, so a wider launch seems likely.

If it does go global, expect a markup over the ¥399 ($59) China price, which is common for Xiaomi accessories once import costs and local taxes kick in.

The WPB1026S is the most pocketable 10,000mAh magnetic power bank Xiaomi has made, and silicon-carbon is the reason. If you own a recent Xiaomi phone, it’s an easy recommendation at $59: thin, light, fast, and built to meet stricter safety rules before they’re required.

If you own an iPhone, we’d pass. The 7.5W wireless speed is too slow for a magnetic pack, and a Qi2-certified alternative will serve you better, even if it’s a few millimeters thicker.

Less often. Phones like Vivo’s Y600s Pro with its 10,200mAh battery can last two days for light users. A power bank still makes sense for travel, heavy gaming, or GPS navigation. The bigger your phone’s battery, the fewer full refills a 10,000mAh pack can give you.

Wattage is only the peak speed. How long a phone holds that peak, how it manages heat, and how its battery is built all change real charging times. That’s why the Galaxy S27 Ultra charges faster on the same 60W as its predecessor.

3C is China’s mandatory safety certification for many electronics. Products need it before they can be sold there, and it often reveals phone charging specs before launch, as with Honor Win 2’s 3C certification. China also bars power banks without 3C marks from domestic flights.

Xiaomi names the Xiaomi 15 and Xiaomi 17 series as compatible with the full 20W. Other phones fall back to standard speeds.

Not in normal use, but heat is the main risk. Wireless charging creates more heat than a cable, and heat slowly wears batteries down. Avoid charging while gaming or leaving the phone in direct sun with a pack attached. Xiaomi’s built-in temperature control helps, but common sense helps more.

Vincee Cole is a technology journalist with four years of experience covering the full spectrum of modern tech — from consumer devices, artificial intelligence, to quantum computing, blockchain, and digital assets. His reporting cuts through complexity to deliver stories that are sharp, grounded, and relevant to both general readers and industry insiders. Previously, he worked with fintech research teams across Southeast Asia, analysing how emerging technologies are reshaping financial systems at scale.