Power banks (External batteries)

Product key benefits:

• Capacity: 25000mAh (88Wh according to the manufacturer)

• 3 ports: UsbC1 (in/out), UsbC2(in/out), UsbA(out)

• PD 3.1 support – 140W (USB-C1)

• Maximum charging power (claimed): 110W, discharging power (claimed): 210W

• The power bank supports pass-through charging (simultaneous charging and discharging)!

• The device screen (which switches off automatically after 30 seconds) displays:

  • A numerical indication of the power bank’s charge level

  • Estimated time remaining until charging or powering of connected devices is complete

  • Total power level (input and output)

  • Power level, voltage, and current for each port

• An additional ‘light strip’ indicator (below the screen) signals that the device is in operation.

• Soft fabric pouch

• Excellent 240W 6A USB-C to USB-C cable (braided nylon coating, 1 meter/3.3ft) compatible with Xiaomi Surge Charge protocol, with a resistance of 117 mOhm (Kelvin 4-wire method)

• It is possible to enable low-current discharge mode (by double-clicking the button); this mode is intended to limit the charging rate (power) of connected devices, but no current limitation was observed during testing.

• ​Supports PD 12V. This is useful if you want to replace a standard 12V AC-DC adapter with a UsbC-DC cable.

• Support the PPS 11V5A and PPS 20V3A together with a 5A-rated cable (100W/240W), ensuring the fastest possible charging Super Fast Charge 2.0/3.0 45W for Samsung S22-S26 smartphones (Plus and Ultra versions), as well as 60W for the Samsung S26 Ultra

• Support for Xiaomi’s proprietary Surge Charge protocol

• ​Energy conversion efficiency - 75% (information from manufacturer)

• ​When a new device is connected to or disconnected from the power bank, power is distributed to all ports without interrupting the power supply; however, when USB-C1 and USB-C2 are in use simultaneously, the maximum power available from USB-C1 is reduced to PD65W (only the protocol changes). No changes in the operation of USB-C1/C2 + USB-A were observed.

• Power distribution between ports (information from manufacturer):

  • 1 port: PD140W (UsbC1) / PD45W (UsbC2) / QC18W (UsbA)

  • 2 ports: PD65W (UsbC1)+PD45W(UsbC2) / PD65W (UsbC1)+QC18W(UsbA)/ PD65W (UsbC2)+QC18W(UsbA)

  • 3 ports: PD65W (UsbC1)+PD45W(UsbC2) + QC18W (UsbA)

• Load testing.

  • PD3.1 140W-22min: power cut-off after 22 minutes of operation under load (maximum temperature 63°C near the USB-A port).

  • PD3.1 110W-7min: power cut-off after 7 minutes of operation under load.

  • PD3.0 ​100W (20V5A)-30min:

    • ​Maximum case temperature: 37°C (a temperature of up to 52°C is recorded around the USB-A port)​​

    • ​The device operates stably

    • ​Ambient temperature: 21-23°C

• Dimensions(mm): 159.9x55.1x55.1

• Weight: 635g

Product drawbacks:

• No support for PPS 21V5A

• The maximum possible 210W can only be achieved when using Xiaomi’s proprietary protocol: 120W (20V6A) + 60W (20V3A) + 30W (10V3A). When using the PD protocol, the maximum available power is only 140W (USB-C1) or 65W + 45W + 18W (QC).

• The power bank failed to complete the minimum 30-minute test period under a load exceeding 100W (PD 3.1).​​

​Supported charging protocols claimed by manufacturer:

• UsbC1 input: 110W (5V3A, 9V3A, 12V3A, 15V3A, 20V5.5A)

• UsbC2 input: 60W (5V3A, 9V3A, 12V3A, 15V3A, 20V3A)

• UsbC1 output: 140W (5V3A, 9V3A, 12V3A, 15V3A, 20V6A, 28V5A)

• UsbC2 output: 60W (5V3A, 9V3A, 12V3A, 15V3A, 20V3A)

• UsbA output: 30W (5V3A, 9V2.23A, 12V1.67A, 5-11V3A)

Supported charging protocols detected by KM003C:

• USB-C1 port:

  • PD3.1 140W (5V, 9V, 12V, 15V-3A, 20V5A, 28V5A)

  • PPS: 5-11V5A, 5-20V3A

  • Xiaomi Surge Charge 120W (5-11V6A, 5-20V6A)

  • DCP

• USB-C2 port:

  • PD3.0 45W (5V, 9V, 12V, 15V-3A, 20V2.25A)

  • PPS: 5-11V3A, 5-20V3A

  • Xiaomi Surge Charge 60W

  • DCP

• USB-A port:

  • FCP 24W (5V2A, 9V1.67A)

  • AFC 18W (5V2A, 9V2A)

  • QC2.0/3.0 (5V, 9V, 12V, 3.6-12V)

  • DCP

Conclusion:

This is a powerful, high-capacity (25,000 mAh, 88Wh), and noticeably heavy (635g) high-end power bank.

It supports the advanced USB Power Delivery 3.1 protocol with up to 140W output, as well as Xiaomi Surge Charge.

Its capacity complies with airline regulations (under 100Wh) for carrying lithium-ion batteries in cabin baggage.

Main usage scenarios:

• powering laptops and other electronic devices during long flights, travel, camping, or outdoor work;

• working in coworking spaces, parks, or cafés with limited access to power outlets;

• use in environments such as hospitals, exhibitions, and long conferences;

• field work: conducting interviews, content creation, and drone operation;

• on-site professional activities: demonstrations, training, sales, and technical presentations;

• powering a mobile router;

• powering a PD soldering iron when no power outlet is available;

• backup power in conditions of unstable or intermittent electricity supply.

According to the documentation, it supports simultaneous charging and discharging, which is useful for powering devices sensitive to interruptions in the electricity supply.

The power bank charges quickly (PD - 100W / Xiaomi - 110W), and the built-in display allows you to monitor remaining charge or discharge time. Power, voltage, and current readings help identify the active charging mode.

In testing, the device could not sustain a full 140 W load for 30 minutes. Stable operation was observed only up to 100 W, which is sufficient for most laptops.

The package includes a high-quality 6 A (240 W) cable and a soft carrying pouch.

The device fully supports reset-free operation; however, the USB-C1 port drops to PD 65 W when both USB-C ports are used simultaneously.