This power bank motherboard is perfect for DIY power banks.
The motherboard comes with a built-in battery protection function, so there is no need for an additional battery protection board.
This board is suitable for 18650 lithium batteries, polymer lithium batteries, ternary lithium batteries and multiple 18650 lithium batteries in parallel.
There are five input and output ports. Support PD, QC and other protocols. It can output 5V3A, 9V2A, 12V1.5A. The input supports 5V/9V12V.
There is a digital tube to display the power level. All 5 USB ports are protected by MOS tubes, which is more secure.
R8 resistor sets the resistance for the battery capacity. The resistance value is calculated as follows
Resistance value = (total battery capacity mAh + 2000) * 5 / 3
For example, the battery capacity is 30000mAh.
Resistance of R8 = (30000 = 2000)*5/3 = 53333Ω.
A resistor of 53K can be used instead.
The resistance value of the R8 resistor can be replaced using an approximation. It does not necessarily need to be very accurate.
Comes with a battery capacity learning function, one complete charging process to learn the current battery capacity.
Packing list: 2PCS 22.5W power power board