Input and Charging Information

When matching with fast charging, the default input is 9V, with a maximum input power of 21W

Supports simultaneous charging and discharging. When operating in single-port mode, it supports fast charging input and output; in multi-port mode, it supports 5V input and output

Supports simultaneous discharging from Type-A1, Type-A2, and Type-C ports

Fast Charging Protocols Supported

Integrated with PPS/PD3.0/PD2.0 fast charging protocols, supporting bidirectional fast charging for both input and output

PPS output supports 5-5.9V @ 3A and 5-11V @ 2A. PD3.0/PD2.0 output supports 5V @ 3A, 9V @ 2A, and 12V @ 1.5A

Input supports 5V/9V/12V voltage

Quick Charge Protocols

Integrated with QC fast charging protocols, supporting QC4+/QC4/QC3.0/QC2.0, Class A. QC2.0 supports 5V/9V/12V output voltages. QC3.0 supports 5V-12V output voltages, adjustable in 200mV steps

Additional Fast Charging Protocols AFC fast charging protocol, with output supporting 5V/9V/12V; input supports 5V/9V

FCP fast charging protocol, with output supporting 5V/9V/12V; input supports 5V/9V

SCP fast charging protocol, with output supporting 5V @ 4.5A; input supports 5.5V @ 3A

PE2.0 and PE1.1 fast charging protocols, with PE2.0 supporting 5V-12V output voltages in 500mV steps; PE1.1 supports 5V/7V/9V/12V output voltages; input supports 5V/9V

SFCP fast charging protocol supporting 5V/9V/12V output voltages

VOOC fast charging protocol, with output supporting 5V @ 4A

Indicators

LED indicators display battery level during discharge

LED indicators display battery level during charging

Charging Process

Current can reach up to 5A with an efficiency of up to 95% Supports battery types of 4.2/4.35/4.4/4.5V Complies with JEITA specifications Supports temperature control

Synchronous Boosting

Output power can reach 22.5W with an efficiency of up to 95% Features automatic load detection/light load detection Supports wireless charging mode Supports low current mode

Output Fast Charging Protocols

Supports PPS/PD3.0/PD2.0 Supports QC4+/QC4/QC3.0/QC2.0 Supports AFC Supports FCP Supports PE2.0/PE1.1 Supports SFCP Supports VOOC

Input Fast Charging Protocols

Supports PD3.0/PD2.0 Supports AFC Supports FC Supports SCP Supports PE1.1

Type-C Interface

Built-in USB Type-C interface logic Supports Try.SRC function

BC1.2 Module

Supports B1.2 DCP mode Supports Apple/Samsung modes

Lightning Decryption

Built-in Lightning decryption function.

Battery Measurement and Display

Built-in 12-bit ADC Built-in coulomb counter for precise measurement

Protection Mechanisms

Input overvoltage protection Output overcurrent/short-circuit protection Charging timeout/overvoltage protection Temperature protection

Charging Process Overview

The charging process consists of three stages: trickle mode, constant current mode, and constant voltage mode When the battery voltage is below 3V, the charging module enters trickle mode with a charging current of 300mA When the battery voltage is above 3V, the module enters constant current mode, charging at the set target current, with a power of about 21W When the battery voltage rises to the target charging voltage (e.g., 4.2V), the module enters constant voltage mode, where the current gradually decreases while the battery voltage remains constant Charging ends when the charging current drops to the cut-off current If the battery voltage drops below the target voltage by 0.1V after being fully charged, charging will automatically restart. (Note: It is normal for the voltage to exceed 4.2V. If the voltage is 4.2V and the LED is still blinking, it indicates that it is not yet fully charged. Full charge is not solely determined by the charging voltage.) USB Ports

The mainboard has a total of 5 USB ports

Type-A1, Type-A2, Micro-B, Type-C, and Lightning. Type-A1 and Type-A2 support QC3.0/QC2.0/AFC/FCP/SCP/PE2.0/PE1.1/SFCP/VOOC fast charging output; Type-C supports PPS/PD3.0/PD2.0/QC4+/QC3.0/QC2.0/AFC/FCP/SCP/PE2.0/PE1.1/SFCP fast charging output, supporting PD3.0/PD2.0.

Notes

The wire connecting the external battery to the mainboard must support at least 10A current, using at least 1 square mm copper wire; a standard wire should use 1.5 square mm. It doesn't need to be too thick, but it should not be too thin either, as this can pose safety hazards (due to high current on the battery side).

The mainboard has a built-in protection chip; no additional protection board is needed for the battery. If one is present, please remove it and connect the battery cells directly to the mainboard (as the built-in protection typically cannot handle high current and will activate under high output power).

For those using alligator clips for testing, please do not charge a mobile phone with this setup. Do not ask why; it simply cannot be done this way. To charge a phone, you must solder the connections.

Use 4.2V 18650/polymer/triple lithium batteries. Large single-cell batteries are acceptable, as well as multiple 18650 cells in parallel. Do not use lithium iron batteries, disposable batteries, nickel-hydride, lead-acid, or nickel-cadmium batteries. Batteries should not be connected in series. If the battery voltage display is inaccurate during the first power-up, fully discharge it and then charge it again. It is recommended to continue charging for over 5 hours after all four LEDs are lit during the first charge; this will not damage the battery.

The mainboard must be preset for the battery capacity. Therefore, it is important to specify the approximate battery capacity when ordering or to communicate with customer service. Otherwise, the default capacity for the outer shell is 30,000mAh, and for the mainboard without the shell, it is 20,000mAh. Alternatively, you can change the resistor yourself later.

Supports OPPO fast charging and Huawei SuperCharge. Different protocols have different power levels, so please understand these details before purchasing. This solution has been sold for a long time; it supports all devices except for some that do not support fast charging (those unsupported devices have proprietary protocols that are not public, and third-party chargers cannot be used; for these devices, please purchase from official websites).

Additional Information

There are several empty solder pads on the back reserved for connecting a solar charging panel. If components are added, it can connect to a 6V solar panel for charging the power bank. However, charging with a solar panel may result in inaccurate battery level displays since it charges the battery directly without going through the power bank's boost or buck circuit; the battery's usability will not be affected. Avoid soldering unless absolutely necessary.

The USB ports are designed with a sinking board to reduce overall height. The overall height when flat is 7.5mm, and the height of the USB-A port is 6mm.

D3/D4/D5/D6 are battery level LEDs, and LED1 is the fast charging indicator.

The NTC1 pad is for soldering the battery protection temperature sensor. A wire will be provided by default to be affixed to the battery surface during assembly; if not needed, simply short the two pads.

All five USB ports have MOSFETs for protection, so there is no need to worry about short circuits at the USB ports. High current traces will use bare copper with solder to lower the temperature of the mainboard during high current operation.

The layout is reasonable, with windows opened and solder added in high current areas to reduce losses and improve charge and discharge efficiency. R8 is the resistor used to set the battery capacity. If the new battery capacity does not differ significantly, there is no need to change it. If the difference is large, please replace the resistor. The resistance value calculation formula is: Resistance (Ω) = (Total battery capacity (mAh) + 2000) × 5 / 3 For example, for a 30,000mAh battery, the resistor should be (30,000 + 2000) × 5 / 3 = 53,333Ω. You can find a similar resistor to substitute, such as 53K.

Both Type-A USB ports are designed with 5P high current USB connectors, with thicker and wider contact copper pieces to increase overcurrent capacity and reduce heat and losses. Supports SCP and VOOC high current output.