Xiaomi Just Killed the Bulky Power Bank: This Insanely Slim 6.75mm Magnetic Charger Changes Everything

Xiaomi has officially launched an upgraded version of its UltraThin magnetic power bank, and the standout feature is its razor-thin profile. Measuring just 6.75 millimeters thick, this new portable battery pack is barely thicker than a few credit cards stacked together. Instead of carrying a heavy, awkward brick in your pocket, you get a clean accessory that snaps straight onto the back of your smartphone and stays out of your way.

For years, portable power banks have carried a reputation for being heavy and inconvenient. Traditional battery packs force you to deal with tangled charging cables while awkwardly holding both your phone and a thick power brick in one hand. Even when first-generation magnetic wireless battery packs arrived on store shelves, many remained bulky enough to double the thickness of a modern mobile device. Xiaomi is tackling that everyday frustration directly with this latest hardware release.

Equipped with a 5,000mAh capacity, 20W wireless magnetic charging, and 27W wired USB-C fast charging, this new gadget delivers dependable mobile power in an ultra-slim body. It is designed for anyone tired of carrying heavy battery backups during daily commutes, long work shifts, or evening outings.

Here is the complete breakdown of how Xiaomi pulled off this ultra-thin design, how fast it actually recharges your phone, what the real-world battery life looks like, and whether this new gadget is worth your money.

What Makes This New Magnetic Power Bank So Crazy Thin?

When you hold a power bank that measures only 6.75 millimeters thick, your expectations for portable chargers get completely reset. Standard flagship smartphones usually measure between 7.5 millimeters and 8.5 millimeters thick. That means this new Xiaomi battery pack is actually thinner than most of the phones you would attach it to.

The exact measurements sit at 101 millimeters long, 71.5 millimeters wide, and 6.75 millimeters thick. Along with that slim profile, the entire accessory weighs just 105 grams. When snapped against the back of your smartphone, it adds virtually no noticeable drag. You can slide your phone directly into your jeans pocket, jacket, or a compact shoulder bag without feeling weighed down.

Earlier generations of slim wireless chargers usually landed between 10 and 15 millimeters in thickness. While they were lighter than giant 20,000mAh blocks, they still made holding your phone with one hand clumsy. Xiaomi clearly designed this revision with daily comfort in mind. The edges are gently curved, allowing the unit to rest smoothly against your fingers while you send messages, take calls, or browse the web.

The power bank is finished in clean black and white color options. It avoids loud branding or unnecessary visual accents, choosing an understated style that pairs cleanly with any phone case or bare glass finish.

The Secret Sauce: Jinshajiang Silicon-Carbon Battery Tech

Fitting 5,000mAh into a casing under 7 millimeters requires serious battery innovation. You simply cannot reach that level of thinness using regular lithium-ion components without compromising battery lifespan or drastically cutting storage capacity.

To achieve this form factor, Xiaomi used its proprietary Jinshajiang silicon-carbon negative electrode technology. Standard power bank batteries rely purely on graphite anodes to store electrical energy. While graphite is dependable and affordable to make, it has reached its physical limits in energy density. By blending silicon into the carbon structure at a high 16 percent ratio, the battery achieves an exceptional energy density of 840Wh/L.

Silicon can store far more lithium ions than graphite alone. This boosted energy density lets engineers pack a full 5,000mAh cell into a footprint that would normally hold only half that capacity under older chemical designs.

This is the exact same battery engineering now appearing across high-end smartphones and flagship mobile hardware. Applying this technology to everyday accessories gives buyers access to top-tier power engineering at an affordable price. To see how custom internal hardware improves everyday devices, read our breakdown of Xiaomi Surge chips and flagship phone technology.

On top of the advanced chemical design, this new edition complies with strict safety certifications, meeting updated national safety standards for commercial battery cells. That certification ensures the battery handles heat expansion smoothly and stays stable over hundreds of charging cycles.

Charging Speeds: How Fast Does It Actually Charge Your Phone?

A super-thin battery pack looks great in photos, but real-world performance is what matters most. Xiaomi upgraded both the wireless and wired outputs on this edition to give users faster recharges than earlier models.

20W Wireless Magnetic Output

The previous version of Xiaomi’s ultra-thin magnetic power bank peaked at 15W wireless output. This upgraded model pushes wireless charging up to 20W. When snapped onto compatible Android smartphones, the magnets lock into place and immediately start delivering steady power without any cables dangling in the way.

A 20W wireless speed makes a real difference during a busy day. Slower 5W or 10W wireless chargers often struggle to increase your battery percentage if your phone screen is active. At 20W, the power bank delivers enough steady power to recharge your battery even while you stream music or use navigation apps.

The iPhone Reality Check: What You Need to Know

While this charger supports 20W wireless speeds on compatible hardware, iPhone owners should keep an important detail in mind. Because Apple restricts wireless speeds for accessories that do not use licensed MagSafe or certified Qi2 standards, iPhones will charge at a maximum wireless rate of 7.5W.

A 7.5W wireless rate is still plenty of power to prevent your battery from draining during a commute or keep your phone alive during dinner. However, it will not charge your iPhone as quickly as an Android phone built for faster magnetic speeds. If you carry an iPhone and need rapid power in a hurry, using the built-in USB-C port is the faster choice.

27W Wired USB-C Fast Charging

When you are short on time, the power bank includes a USB-C port that supports up to 27W wired power delivery. Connecting a short USB-C cable turns this slender accessory into a true fast charger capable of quickly reviving modern smartphones, tablets, or wireless earbuds.

The port supports key industry charging protocols, including USB Power Delivery (PD) and Quick Charge (QC). This broad compatibility means it works smoothly across phones from different brands. The USB-C port also handles fast recharging for the power bank itself. When the 5,000mAh battery runs dry, plugging it into a 27W wall plug quickly refills the pack so you can head back out without delay.

Two-Way and Pass-Through Charging

Pass-through charging is one of the most useful features on this unit. At night, you do not need two separate wall outlets to charge your phone and your external battery. You simply plug the power bank into a wall charger with a USB-C cable and snap your phone onto the magnetic charging pad.

The power bank manages power delivery automatically, charging your smartphone wirelessly while recharging its own internal cell at the same time. When you wake up, both gadgets are sitting at 100 percent. You can also charge two devices at the same time on the go: one charging wirelessly on the magnetic pad and another plugged into the USB-C port.

Real-World Usability: What Can 5,000mAh Really Do?

When buying a portable battery, understanding rated capacity versus typical capacity helps set the right expectations. The Xiaomi UltraThin magnetic power bank carries a typical cell rating of 5,000mAh at 3.7V, which equals 18.58Wh of total battery energy.

However, converting electricity from an internal battery cell into your phone always involves minor energy loss through heat and resistance. That leaves the unit with an effective rated output of roughly 3,000mAh at standard 5V/2A delivery.

In practical daily use:

• It provides between 70 percent and 90 percent of a full charge for standard smartphones with 4,000mAh to 5,000mAh batteries.
• For compact phones with smaller batteries, it can deliver nearly a full 100 percent recharge.
• For smartwatches and true wireless earbuds, it holds plenty of reserve power to recharge them multiple times.

This accessory is not built to power an entire workstation over a weekend camping trip. If you need multi-day backup for laptops and tablets, you will need a heavier battery brick. Instead, this ultra-thin pack works as an everyday safety cushion. It sits quietly in your pocket, ensuring your phone never shuts down unexpectedly before you get home.

With major phone brands no longer including charging accessories in the box, keeping practical backup power on hand has become essential. To read more about how phone companies made this transition, check out our report on why new phone brands ship without chargers in the box.

Heat Management and Daily Durability

Managing heat inside a device that is just 6.75 millimeters thick is a tough engineering challenge. Trapped heat slows down charging speeds, cuts efficiency, and damages battery health over time.

Xiaomi solved heat dissipation by installing a large 4,369 square-millimeter graphite thermal sheet directly beneath the outer casing. Graphite spreads heat quickly across the entire surface of the charger, preventing localized hot spots from forming near the charging coils or internal logic board.

During heavy 20W wireless charging or 27W wired delivery, the outer shell will naturally feel warm to the touch, which is normal for any fast-charging system. Built-in thermal sensors actively monitor internal conditions. If the charger detects rising heat, it automatically adjusts power delivery to protect your phone and maintain battery safety.

Durability is handled well too. The housing uses fire-retardant materials covered in an anti-scratch matte finish. It holds up well against everyday friction when stored in bags alongside keys, pens, and loose coins.

Travel Friendly: Safe for Airline Flights

Frequent travelers know the frustration of airport security checkpoints when carrying external battery packs. Airport staff routinely seize power banks that lack clear specification labels or exceed legal capacity limits.

The Xiaomi UltraThin magnetic power bank is fully compliant with global travel standards. Because its energy rating is only 18.58Wh, it sits far below the strict 100Wh ceiling set by international aviation authorities like the FAA and ICAO.

All technical specifications, voltage details, and regulatory safety marks are printed clearly on the body of the charger. You can carry it through airport security scanners and keep it in your carry-on luggage without questioning from security staff.

Device Compatibility Across Android and Apple

Thanks to universal wireless charging standards, this magnetic power bank connects with a wide variety of mobile hardware.

For iPhone owners using MagSafe models (from the iPhone 12 family forward), the charger snaps firmly onto the rear glass. Built-in neodymium magnets create a tight, secure hold so the charger will not slip off when you pull your phone out of your pocket or bag.

On the Android side, several modern smartphones come with built-in magnetic charging coils. Even if your current Android phone lacks internal magnets, you can use any standard magnetic case or stick-on ring to get the exact same snap-on experience. As long as your device supports standard wireless charging, power transfers seamlessly.

Xiaomi continues to produce a wide lineup of mobile devices under different sub-brands. If you want a clear breakdown of how the company organizes its phones and accessories, take a look at our complete guide on the differences between Xiaomi, Redmi, and Poco devices.

If you are thinking about pairing this charger with a pre-owned or secondary smartphone, it pays to shop carefully. Be sure to check our guide on the hidden risks of refurbished phones and how to buy safely to avoid battery problems on second-hand devices.

Price and Availability: Is It Worth Buying?

Xiaomi launched the updated 27W edition of the Jinshajiang Ultra-Thin Magnetic Power Bank in China on its official Xiaomi Youpin platform for 299 yuan, which converts to roughly $42 to $43 USD.

When compared against competing options on the market, the pricing makes a compelling case:

• Standard magnetic chargers from third-party accessory makers typically cost between $35 and $55, but almost all of them measure between 12 and 16 millimeters thick.
• Ultra-slim designer magnetic battery packs from boutique brands frequently cost over $70 while offering slower charging rates and lower battery efficiency.
• Apple’s discontinued MagSafe Battery Pack retailed for $99, offered slower charging speeds, and had a lower overall battery capacity.

For roughly $43, you get an ultra-slim 6.75mm profile, advanced silicon-carbon battery cells, 20W wireless speeds, 27W wired power delivery, and full airline approval. For daily commuters, office professionals, students, and travelers who dislike carrying bulky accessories, this power bank hits a sweet spot.

While the charger launched first in domestic retail channels, international buyers can expect units to arrive through global online storefronts and regional import partners in the coming weeks.

Frequently Asked Questions (FAQs)

Will this Xiaomi magnetic power bank work with any phone?

Yes, as long as your phone supports wireless charging. If your phone has built-in magnets, like recent iPhones, it snaps into place immediately. For phones without built-in magnets, using a magnetic phone case or an adhesive magnetic ring delivers the same snap-on grip. You can also connect any phone directly using a USB-C charging cable.

How fast does this power bank charge an iPhone?

When charging an iPhone wirelessly, the speed is limited to 7.5W because Apple restricts third-party wireless chargers that do not use certified MagSafe technology. If you need a faster recharge on an iPhone, simply plug a USB-C cable into the power bank’s 27W port for quick wired charging.

Does the power bank become hot while charging?

The charger will feel warm during 20W wireless charging or 27W wired delivery, which is standard for fast-charging electronics. However, the internal 4,369mm² graphite cooling sheet and built-in heat sensors regulate temperature levels automatically to keep both your phone and the power bank safe.

Is this power bank allowed on commercial flights?

Yes. International aviation regulations permit power banks rated below 100Wh in carry-on baggage. With a rating of 18.58Wh, this power bank sits well beneath the maximum allowable limit. Always carry power banks in your hand luggage rather than checked baggage.

Can I charge my phone and the power bank at the same time?

Yes, the device supports two-way pass-through charging. You can plug the power bank into a wall adapter using a USB-C cable and place your phone on top. The power bank will charge your phone wirelessly while replenishing its own internal battery cell simultaneously.

How much extra battery life will this provide in a typical day?

The 5,000mAh battery has an effective rated output of around 3,000mAh after normal voltage conversion. In daily use, that translates to an extra 70 to 90 percent charge for most modern smartphones. It provides an ideal daily safety boost to keep your device running through the evening without adding pocket bulk.

Xiaomi’s new 6.75mm UltraThin magnetic power bank proves that portable chargers do not have to feel like heavy bricks to offer meaningful battery backup. By combining silicon-carbon battery tech with 27W wired output and 20W wireless convenience, it sets a practical new standard for everyday phone accessories.