Lithium battery protection boards have different circuits and parameters according to different ICs and voltages used. Commonly used protection ICs are 8261, DW01+, CS213, GEM5018, etc. Among them, Seiko's 8261 series have better accuracy and of course the price is more expensive. The latter are from Taiwan. The domestic secondary market basically uses DW01+ and CS213. The following is an explanation with DW01+ with MOS tube 8205A (8pin): The normal working process of the lithium battery protection board is: When the cell voltage is 2.5 When between V and 4.3V, DW01 pin 1 and pin 3 output high level (equal to the supply voltage)Lithium battery protection boards have different circuits and parameters according to different ICs and voltages used. Commonly used protection ICs are 8261, DW01+, CS213, GEM5018, etc. Among them, Seiko's 8261 series have better accuracy and of course the price is more expensive. The latter are from Taiwan. The domestic secondary market basically uses DW01+ and CS213. The following is an explanation with DW01+ with MOS tube 8205A (8pin): The normal working process of the lithium battery protection board is: When the cell voltage is 2.5 When between V and 4.3V, DW01 pin 1 and pin 3 output high level (equal to the supply voltage)Lithium battery protection boards have different circuits and parameters according to different ICs and voltages used. Commonly used protection ICs are 8261, DW01+, CS213, GEM5018, etc. Among them, Seiko's 8261 series have better accuracy and of course the price is more expensive. The latter are from Taiwan. The domestic secondary market basically uses DW01+ and CS213. The following is an explanation with DW01+ with MOS tube 8205A (8pin): The normal working process of the lithium battery protection board is: When the cell voltage is 2.5 When between V and 4.3V, DW01 pin 1 and pin 3 output high level (equal to the supply voltage)Lithium battery protection boards have different circuits and parameters according to different ICs and voltages used. Commonly used protection ICs are 8261, DW01+, CS213, GEM5018, etc. Among them, Seiko's 8261 series have better accuracy and of course the price is more expensive. The latter are from Taiwan. The domestic secondary market basically uses DW01+ and CS213. The following is an explanation with DW01+ with MOS tube 8205A (8pin): The normal working process of the lithium battery protection board is: When the cell voltage is 2.5 When between V and 4.3V, DW01 pin 1 and pin 3 output high level (equal to the supply voltage)Lithium battery protection boards have different circuits and parameters according to different ICs and voltages used. Commonly used protection ICs are 8261, DW01+, CS213, GEM5018, etc. Among them, Seiko's 8261 series have better accuracy and of course the price is more expensive. The latter are from Taiwan. The domestic secondary market basically uses DW01+ and CS213. The following is an explanation with DW01+ with MOS tube 8205A (8pin): The normal working process of the lithium battery protection board is: When the cell voltage is 2.5 When between V and 4.3V, DW01 pin 1 and pin 3 output high level (equal to the supply voltage)