BMS 3S (12.6V - 20A ) Lithium Battery Protection Module

Description:

The 3S 20A 12.6V Battery Management System (BMS) PCB Board is designed to protect and charge 3-series lithium-ion battery packs.

It ensures overcharge, over-discharge, and short-circuit protection, making it an essential safety component for battery-powered applications.

This lightweight and compact module supports 18650, 26650, and polymer lithium batteries, offering a high discharge capacity of up to 20A. Ideal for DIY battery packs, e-bikes, solar projects, and powerbanks.

Features:

• 3S 11.1V 12.6V 20A 18650 lithium battery Management board.
• Application: Nominal voltage of 3.6V, 3.7V lithium battery (including 18650.26650, a polymer lithium battery).
• Continuous discharge current (upper limit): 20A (if the cooling environment is not good, please reduce the load current use).
• Continuous charge current (upper limit): 20A.
• Suitable for starting current below 40A, power 65W below the drill.

Specifications:

• Charging Voltage: 12.6V-13V
• Overcharge Voltage Range: 4.25V-4.35V ± 0.05V
• Overpressure Voltage Range: 2.3V-3.0V ± 0.05V
• Continuous charge current (upper limit): 10A
• Maximum discharge current is 20A
• Quiescent Current: less than 30uA
• Internal Resistance: less than 45mohm
• Effective Life: more than 50,000 hours
• Operating Temperature: -40- +50 degrees
• Storage Conditions: -40- +80 degrees
• Continuous discharge current (upper limit): 20A (if the cooling environment is not good, please reduce the load current use)
• Continuous charge current (upper limit): 10A.
• Size is approximate 59x20x3.5mm

Precautions:

• Please strictly follow the wiring 0V (B -), 3.7V (B1), 7.4V (B2), 11.1V (B +), do not deliberately short circuit.
• Please charge after connecting the line, then it will have output.
• When connecting three groups of batteries, please ensure that the voltage of each group of batteries, if not the same, please fill each battery separately and then use in series. Discharge test, the voltage drops quickly when the group of battery time difference battery.
• Please do not mix the battery and the poor battery together! 3 sets of battery capacity/resistance closer to the better! (Two good batteries +1 a poor battery use effect = 3 poor battery use effect).