- Disclaimer: sample used is provided by Xiaomi. Mostly Melbourne as reseller is affiliated with Xiaomi and has vested interest. This article does not represent an advice of purchase.
- Product Link: mostlymelbourne.com | Amazon Link
Original article https://www.chongdiantou.com/archives/383483.html
Posted by @huanghongye
Table of Contents
Introduction
Xiaomi has recently launched a new 25000mAh capacity power bank, model P03MI, with an impressive 212W total output power. It features a 2C1A interface configuration, with both USB-C ports supporting input and output. The USB-C1 port supports 100W charging input and 140W output, while the USB-C2 port supports 45W input/output, and the USB-A port supports Xiaomi's proprietary 120W fast charging protocol.
The device includes a color LCD screen that displays battery percentage, remaining mAh, and output mAh, along with protocol display functionality. The charging UI features a green interface, while the discharging UI is yellow for easy status identification. The power bank uses a plastic shell with transparent plastic covers on three sides, with an exploration-style decorative panel below the front screen, creating a strong cyberpunk aesthetic.
Unboxing
The Xiaomi 212W HyperCharge Power Bank 25000mAh packaging maintains Xiaomi's typical minimalist style, with a white background featuring the product name at the top, a thumbnail image of the power bank, and "90.8Wh capacity" and "Airline Safe" text below.
The package includes:
- Power bank unit
- USB-C to USB-C charging cable
- User manual
- Warranty card
The included USB-C to USB-C cable features textured ends for easy grip and anti-bend strain relief. Testing with ChargerLAB POWER-Z KM003C shows the cable has an E-Marker chip with 20V/5A power transmission capability and measures approximately 101.5cm in length.
Appearance
The Xiaomi power bank features a rectangular design with transparent decorative panels on three sides giving it a distinctive tech-forward appearance. The edges are crisp yet comfortable to hold thanks to rounded corners.
The front panel houses an LCD screen at the top, a function button, and a decorative panel in the middle, with "25000" marked at the bottom to indicate capacity.
The LCD screen can display:
- Current remaining power
- Supported fast charging protocols
- Charging status with percentage, remaining charge time, and mAh
- Discharge status with remaining power, mAh, and output speed
The yellow button serves as both power on/off and page switching control.
The sides use hex screws for assembly, and product information is printed on both sides and the back. The device measures approximately 159.8mm × 55.3mm × 55.3mm and weighs around 627.3g.
The top features three USB ports (2C1A) with clear markings for input/output capabilities. The USB-C1 port is marked with "140W MAX" while the USB-A port shows "120W MAX" output power.
Protocol Testing
Using the POWER-Z KM003C tester, the protocol support was verified:
USB-C1 port supports:
- QC3.0, PD3.1, PPS, QC5, DCP, Apple 2.4A charging protocols
- Fixed voltage levels: 5V/3A, 9V/3A, 12V/3A, 15V/3A, 20V/5A, 28V/5A
- PPS ranges: 5-11V/5A, 5-20V/5A
USB-C2 port supports:
- QC3.0, FCP, SCP, AFC, PD3.0, PPS, QC4+, DCP, Apple 2.4A protocols
- Fixed voltage levels: 5V/3A, 9V/3A, 12V/3A, 15V/3A, 20V/2.25A
- PPS ranges: 5-11V/3A, 5-20V/2.25A
USB-A port supports:
- QC3.0, DCP, Apple 2.4A charging protocols
Product Testing
Charging Compatibility Testing
Testing with various devices revealed impressive compatibility:
| Port | Device | Voltage (V) | Current (A) | Power (W) |
|---|---|---|---|---|
| USB-C1 | MacBook Pro 16 M1 Max | 27.73 | 4.76 | 132.07 |
| Legion Go | 19.48 | 4.55 | 88.69 | |
| Redmi K60 Ultimate Edition | 16.51 | 5.14 | 84.81 | |
| USB-C2 | MacBook Pro 16 M1 Max | 19.89 | 2.18 | 43.40 |
| Huawei MateBook X | 19.84 | 2.19 | 43.36 | |
| Legion Go | 19.85 | 2.16 | 42.89 | |
| USB-A | Redmi K60 Ultimate Edition | 18.14 | 5.30 | 96.17 |
Most smartphones negotiated 9V output, while PPS-compatible phones reached 18V for higher charging power. Tablets and laptops typically negotiated 15V or 20V.
Multi-port Output Testing
When using multiple ports simultaneously:
- C1 + C2 ports charged a laptop and phone at 43.39W and 84.25W respectively
- Using all three ports simultaneously delivered 60.6W, 22.1W, and 85.36W
Charge-while-Discharge Testing
The power bank supports charge-while-discharge functionality:
- When C1 port received 42.99W input, C2 output provided 60.44W and A output delivered 85.15W
Full Charging Test
Using a 140W Cuktech charger to fully charge the power bank:
- Initial negotiation at 20V with power increasing to 85W for the first 13 minutes
- Power then dropped to around 40W until 1 hour 35 minutes
- Power gradually decreased until fully charged
- Total charging time: 2 hours 50 minutes
- 50% charge: 53 minutes
- 80% charge: 1 hour 33 minutes
Output Efficiency
The power bank was tested at different output levels to measure efficiency:
| Output Level | Actual Output | Battery Capacity | Efficiency |
|---|---|---|---|
| 5V/3A (15W) | 68.83Wh | 90.8Wh | 75.8% |
| 9V/3A (27W) | 73.19Wh | 90.8Wh | 80.61% |
| 12V/3A (36W) | 75.9Wh | 90.8Wh | 83.59% |
| 15V/3A (45W) | 76.1Wh | 90.8Wh | 83.81% |
| 20V/5A (100W) | 75.71Wh | 90.8Wh | 83.38% |
| 28V/5A (140W) | 22.36Wh* | 90.8Wh | N/A |
* Overheating protection triggered after 9 minutes
Ripple Testing
No-load ripple:
- Lowest ripple: 15V/0A (28.4mVp-p)
- Highest ripple: 20V/0A (36.8mVp-p)
Load ripple:
- Lowest ripple: 15V/3A (30.4mVp-p)
- Highest ripple: 28V/5A (38.4mVp-p)
Temperature Testing
Under 140W (28V/5A) continuous output for 9 minutes:
- Maximum temperature reached approximately 48.1°C
- Heat concentrated around the USB ports
- Warm but not uncomfortable to touch
Conclusion
The Xiaomi 212W HyperCharge Power Bank 25000mAh combines striking design with impressive technical capabilities. The transparent panels with visible circuitry create a strong tech aesthetic, enhanced by the color display for real-time monitoring.
Its high-power output capabilities—particularly the 140W USB-C1 port and 120W USB-A port with proprietary protocol support—make it incredibly versatile for charging everything from smartphones to high-power laptops. Testing with a MacBook Pro 16 M1 Max demonstrated power delivery up to 132W, while Xiaomi devices enjoyed optimized charging experiences.
The power bank's efficiency ratings above 75% across all power levels (reaching up to 83.81% at 15V/3A) indicate excellent power conversion, while temperature control remained effective even at high loads.
With comprehensive protocol support, three-port simultaneous charging, and charge-while-discharge capability, this power bank offers exceptional versatility for users needing reliable power in any scenario—whether in a taxi, high-speed rail, or airplane.