3.7V Battery Pack BMS 20s 72V 50A E-Bike Li Ion Battery 18650 BMS Battery BMS Charging Voltage 54.6V with Balance - China 72V BMS, Lithium Ion Battery | Made-in-China.com
Amazon.com: 3Series 50A 11.1V/12V/12.6V BMS PCB Protection Board for 18650 Li ion Battery Cell with Balance