4S 40A 16.8V 18650 Li-ion Battery Protection Board (BMS)

Add an extra layer of protection to the charging and discharging mechanism of the 18650 Batteries in your project. 

• Model: 4 string 16.8V lithium battery protection board
• Size: about  45 * 55 * 3.4mm 
• Charging voltage: 16.8V - 18.1V
• Continuous discharge current (upper limit): 40A (if the cooling environment is not good, please reduce the load current use)
• Continuous charge current (upper limit): 20A