Lithium Battery Charger Protection Module (BMS) 4S 40A 16.8V

From the shop's description

Specification of 4S 40A 14.8V BMS Lithium-ion 18650 Battery Protection Board Battery: 4 Cell Overcharge detection voltage (V): 4.25 ± 0.025 Over-discharge detection voltage (V): 2.50 ± 0.08 Over current Protection (A): 40 Working current (A): 20 Operating Temperature (°C): -40 ~ +85 Length (mm): 60 Width (mm): 45 Height (mm): 3.5 Features of 4S 40A 14.8V BMS Lithium-ion 18650 Battery Protection Board 4 string 16.8V 40A lithium battery protection board (comes with recovery function-AUTO Recovery). Scope: Nominal voltage of 3.6V, 3.7V lithium battery (including 18650,26650, a polymer lithium battery). 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.