Feature:1. Switching frequency up to 1MHz, compensating for voltage loss in quasiCV mode.2. Automatic charging of battery internal resistance and tracking resistance.3. Protect the battery voltage from lower than the input voltage and battery short circuit, strong adaptability to the input power, limited drive capacity, overvoltage protection battery.4. Made of highquality materials, strong and durable, has a long service life.5. Small size, easy to carry and store, convenient to use and with good performance.Specification:Item Type: Li-ion Battery Charger Module3 Sections (3S) 12.6V Version: Input Voltage: DC 3- 6V (recommended DC 3.7V 5V)Input Current: 4A (4A version)Charging Voltage: 12.6VCharging Current: 1.48A (4A version).Package List:1 x Li-ion Battery Charger Module