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Neexgent Bms Lithium Ion 18650 Battery Pack 3s 12v 20a Bms Bt For Solar Lamp

It is an intelligent protection board scheme specially designed for 3 ~ 4 series battery packs of power tools, 12V starting power supply, medical batteries and other products. It is suitable for lithium batteries with different chemical properties, such as lithium ion, lithium polymer, lithium iron phosphate, etc.The protection board has strong load carrying capacity and the maximum continuous discharge current can reach 20A.
● 3-4 cell series protection 
● Various protection functions for charging and discharging 
● Discharge over current, short circuit protection functional processes of hardware 
● Over voltage, under voltage, temperature and overload protection function processing of software 
● Accurate SOC calculation with automatic SOC learning function 
● With UART communication 
● RS485 communication with isolation 
● Hardware discharge over-current, short-circuit protection function processing

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Discharge current




Discharge overcurrent protection value 




Internal resistance of main circuit conduction

<10 mΩ

Charging current (same mouth)




Charging current (sub-port)


Charging voltage

Number of three battery strings X 4.2V

Lithium iron phosphate battery pack string number X 3.6V


Overcharge protection 

Equalization voltage

Detection voltage: Ternary 4.25±0.03V LiFe 3.75±0.03V 

Detection voltage: Ternary 24.0 V LiFe 23.4V

Detection delay time: 1000 mS

Dissolution voltage: ternary < 4.0V lithium iron < 3.4V

Discharge voltage: Ternary 415±0.025V LiFePO4 3.6±0.05V

Equalization current: 50-60 mA


Over-discharge voltage protection

Over-discharge current protection

Detection voltage: Ternary 2.7±0.1V LiFe 2.5±0.1V

Detection voltage: ternary 150mV lithium iron 150mV

Detection delay time: 1000 mS

Detection delay time: 5mS

Dissolution voltage: Ternary 2.9±0.1V LiFe 2.7±0.1V

Release condition: disconnect load/charge activated


Short circuit protection

Temperature control protection

Trigger condition: external load short circuit

Discharge over temperature protection: 75+5℃

Detection delay time: 25011s 

Discharge high temperature lifting temperature: 60℃

Release condition: disconnect load/charge activated



Self-consumption of electricity

Operating temperature

Release condition: disconnect load/charge activated

Temperature range: -20℃ / +80℃

Operating power consumption: < 40 uA


Sleep-overdischarge power consumption: < 30 uA