10pcs 4S 16.8V BMS PCB 18650 Lithium Battery Charger Protection Board Balanced Current 100mA

Feature:Name: Lithium battery balancing boardScope of application: 3.7V Nominal voltage, 4.2V full voltage lithium battery (including 18650, 26650, polymer lithium battery)Size: 20 x 30 x 2.4mmAdaptab