Features 1、Switching frequencies up to 1MHz, compensate for voltage loss in quasi‑CV mode. 2、The internal resistance and tracking resistance of the battery are charged automatically. 3、Protection battery voltage is lower than the input voltage and battery short circuit. 4、Strong adaptability to the input power supply, driving capacity is limited over voltage protection battery. 5、Section 4 (4S) Version 16.8V, input voltage DC 3‑6V (DC 3.7V 5V is recommended). Specification Condition: 100% Brand New Item Type: Battery Charger Module Material: Plastic Section 4 (4S) Version 16.8V: Input Voltage: DC 3-6V (DC 3.7V 5V is recommended) Input Current: 2A (version 2A) Charging Voltage: 16.8V Charging Current: 0.56A (version 2A) Package List 1 x Battery Charger Module