Xiaomi Ultra Slim 5000
Ten millimetres thick and 93 grams: a power bank the size of a bank card that slips into a back pocket without you feeling it.
Characteristics
- Capacity: 5,000 mAh (19.4 Wh)
- Format: 113 x 53 x 10 mm, 93 g
- Power: 20W max, bidirectional USB-C
- Recharging: 18W, about 1 h 45
- 10 mm thick, the footprint of a bank card
Detailed overview: Xiaomi card-sized 5000 mAh power bank
The Xiaomi Ultra Slim 5000 answers a precise need: carrying a reserve of energy at all times without ever thinking about it. At 113 x 53 mm and 10 mm thick, it occupies the footprint of an elongated bank card and the thickness of two stacked cards. Its 93 g compare to a small smartphone. That format, more than the spec sheet, is what defines the product.
Capacity follows the same logic: 5,000 mAh, or 19.4 Wh of real energy (4,900 mAh as the rated figure, as Xiaomi states). In practice that means one full smartphone charge, not two. So it should not be compared to a 20,000 mAh travel pack, but to a daily safety net: the commute, a day at the office, an evening that runs long, a short-haul flight.
On power, the single USB-C port is bidirectional and reaches 20W on output, enough to bring an iPhone to around 50% in half an hour. On input it accepts 18W and fills completely in 105 minutes. A USB-C cable comes in the box, a detail that matters on a product designed to leave the house as is. Xiaomi lists nine electronic protections, the market standard in this segment.
Its limits are the direct counterpart of its format. The single port rules out powering two devices at once. There is no display, only four indicator lights, and no wireless charging. At 19.4 Wh it obviously travels in the cabin with no paperwork at all, far below the 100 Wh threshold. For anyone after the battery you carry every day rather than the one you pack for a trip, this is one of the most accomplished offers on the market.
Full specifications
Detailed characteristics
Battery
| Rated capacity?Cell capacity in milliamp-hours, as stated by the manufacturer. | 5000Â mAh |
|---|---|
| Actual energy?Actual stored energy in watt-hours; what matters for runtime and air travel (100 Wh cabin limit). | 19.4Â Wh |
| Battery chemistry?Cell type; LFP lasts longer, Li-ion/LiPo is lighter. | Li-ion |
Output (device charging)
| Max output power?Maximum total power delivered; above 60 W it can charge a laptop. | 20Â W |
|---|---|
| USB-C ports?Number of USB-C ports and the fastest port's power. | 1 × 20 W |
| Fast-charge protocols?Supported fast-charge standards (PD, QC, PPS…); PD/PPS is the most universal. | USB PD |
| Wireless charging (Qi)?Inductive charging of a phone placed on top, and its power. | No |
| Magnetic attachment (MagSafe)?Attaches magnetically to the back of a MagSafe-compatible iPhone. | No |
Recharging the power bank
| Recharge power (input)?Maximum input power to recharge the power bank; higher means faster. | 18Â W |
|---|---|
| Recharge time 0-100%?Time to fully recharge the power bank. | 105Â min |
| Pass-through charging?Can charge a device while being recharged itself (pass-through). | No |
Cable and interface
| Built-in cable?A cable is permanently attached to the power bank (nothing extra to carry). | No |
|---|---|
| Retractable cable?The built-in cable retracts into the housing. | No |
| Cable included?A cable is included in the box. | Yes |
| LED light?Built-in LED torch / light. | No |
Form factor
| Weight?Weight of the power bank, in grams. | 93Â g |
|---|---|
| Dimensions (L × W × D)?Length × width × depth, in millimetres. | 113 × 53 × 10 mm |
Warranty
| Warranty?Length of the manufacturer's warranty. | 2Â years |
|---|
⚡ How many charges with this power bank?
With 19.4 Wh of capacity, the Xiaomi Ultra Slim 5000 power bank recharges iPhone 16 ~1 times or Samsung Galaxy S25 ~0.9 times.
| Smartphone | Charges |
|---|---|
| iPhone 12 | ~1.3 |
| iPhone 14 | ~1.1 |
| iPhone 14 Pro Max | ~0.8 |
| Google Pixel 10 | ~0.7 |
| Tablet / console | Charges |
|---|---|
| PlayStation Portal | ~0.9 |
| iPad Air (M3) | ~0.5 |
| iPad Pro | ~0.4 |
| Steam Deck | ~0.3 |
Rough estimate: real-world losses (conversion, cable, heat) are around 25 to 35%.
Comparison
In the pocket-battery segment, the Xiaomi Ultra Slim 5000 competes with the compact models targeted by searches such as "slim power bank" or "card-sized power bank". Here is how it sits against three references from our catalogue: the Anker Nano 5000, the Nitecore Carbon 6K and the Xiaomi Mi Power Bank 3.
| Criterion | Xiaomi Ultra Slim 5000 | Anker Nano 5000 | Nitecore Carbon 6K | Xiaomi Mi Power Bank 3 |
|---|---|---|---|---|
| Capacity | 5,000 mAh (19.4 Wh) | 5,000 mAh | 6,000 mAh | 10,000 mAh |
| Thickness | 10 mm | ≈ 25 mm | ≈ 12 mm | ≈ 15 mm |
| Weight | 93 g | ≈ 100 g | ≈ 66 g | ≈ 233 g |
| Maximum power | 20W | 22.5W | 18W | 18W |
| Cable supplied | Yes, USB-C | Built-in connector | No | No |
In short, the Ultra Slim wins on the one criterion that really matters here: thickness. Its 10 mm make it the most discreet of the group, where the Anker Nano, at the same capacity, adopts a stubby 25 mm body with a built-in connector. The Nitecore Carbon 6K remains the lightest thanks to its carbon-fibre shell and offers a little more capacity, but costs appreciably more and ships without a cable. The Mi Power Bank 3 doubles the capacity for two and a half times the weight: the classic trade-off between endurance and discretion. If the goal is to have a battery on you at all times, the Ultra Slim is the obvious pick.
Related video
Video: I Tried This Slimmest POWER BANK !! 🤯 - Xiaomi Ultra Slim - Published on 07/01/2026
Our tester's review: Guillaume Hoarau
You have to hold it to understand the point. At 10 mm and 93 g, the Ultra Slim slides into a shirt pocket, into a backpack sleeve, even into a slightly generous card holder, where a 10,000 mAh pack forces you to open the bag. It is an object you carry without thinking about it, and that is exactly the use it targets. The 20W USB-C port does the job on a phone: half an hour brings an iPhone back to roughly half charge, which comfortably covers the end of an evening or a journey. The port is bidirectional, so one cable both empties and refills it, and that cable is in the box, which is no longer a given. The limits are deliberate and worth knowing before buying. Its 5000 mAh give one phone charge, one, not two: this is not a travel battery, it is a safety net for the day. The single port rules out charging two devices at once, and with no display you rely on four indicator lights. Finally, 20W is modest next to the 45 or 65W of thicker models. But none of those models disappears into a pocket, and that is the whole point.
Frequently asked questions: Xiaomi card-sized 5000 mAh power bank
One full charge, not two. With 19.4 Wh of usable energy it fills an average smartphone completely once. This is a battery for a day's insurance, not a weekend reserve.
Yes, a USB-C cable is included in the box. As the port is bidirectional, that same cable both recharges the pack and powers your devices.
No, it has a single USB-C port. That is the deliberate counterpart of its 10 mm thickness: there is simply no room for a second connector.
Yes, with no formalities at all. Its 19.4 Wh sit far below the 100 Wh threshold above which airlines require approval. Like any power bank it travels in hand baggage.
Other products in the "Compact power banks" category
Anker Nano A1653
See price (57)
A pocket 5000 mAh power bank that plugs straight into the phone thanks to its built-in foldable USB-C connector, 22.5 W and barely 100 g.
Anker Zolo 10000 (30W)
See price (55)
A 10,000 mAh pocket pack with its USB-C cable already attached: 30 W fast charging and three devices powered at once, with no cord to carry.
Nitecore Carbon 6K
34.79€ (6)
88 g, IP68 and a carbon-fiber shell: the Nitecore Carbon 6K is an ultra-portable 6000 mAh power bank that also extends Nitecore 6K headlamps.
Nitecore NB10000
See price (9)
Ultralight (150 g) and clad in carbon fibre, the Nitecore NB10000 offers 10,000 mAh that shrug off water and knocks, ideal for hiking.
Published on 28/07/2026