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 simultaneous charging and discharging! This means it can be used as an uninterruptible power supply (UPS).

• 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

• 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 very useful if you want to replace a standard 12V AC-DC adapter with a UsbC-DC cable.

• Support for PPS 20V/5A and PPS 20V3A, together with a 5A-rated cable (100W/240W), ensures the fastest possible charging Super Fast Charge 2.0 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

• 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)

• ​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.

  • 140W-20min: power cut-off after 22 minutes of operation under load (maximum temperature 63°C near the USB-A port).

  • 110W-30min: power cut-off after 7 minutes of operation under load.

  • ​100W (20V5A)-30min:

    • ​Maximum case temperature: 37°C (inside; a temperature of up to 52°C is recorded via 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 5V1.5A

• USB-C2 port:

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

  • PPS: 5-11V3A, 5-20V3A

  • Xiaomi Surge Charge 60W

  • DCP 5V1.5A

• USB-A port:

  • FCP 24W (5V2A, 9V1.67A)

  • AFC 18W (5V2A, 9V2A)

  • QC2.0/3.0 (5V, 9V, 12V, 3.6-12V)

  • DCP 5V1.5A

 

Conclusion:

This is a powerful, high-capacity (25,000mAh – 88Wh) and noticeably heavy top-of-the-range power bank. It supports the advanced PD 3.1 140W protocol, as well as Xiaomi Surge Charge. Its capacity complies with airline regulations regarding the capacity of lithium-ion batteries that may be carried in the aircraft cabin.

The main use case for such a high-capacity power bank is to power laptops and other electronic gadgets during long flights, on holiday, when camping, or in the countryside.

Its ability to act as an uninterruptible power supply (simultaneous charging and discharging) can come in handy in situations where you need to safeguard a power-critical device in the event of an unexpected power cut.

The power bank charges very quickly (PD 100W / Xiaomi 110W), and thanks to the handy on-screen display, you can see how long the charging or discharging process will take. The power, voltage and current readings also help you understand which charging mode your devices are using.

It is disappointing that the power bank was unable to complete the 30-minute test period under full load; stable operation was only recorded at a load of 100W.

The power bank comes with an excellent 6A 240W cable and a soft fabric case.

This is a 100% reset-free device; however, the USB-C1 port switches to PD65W when both USB-C ports are in use.