Multi-Cell 2S 3S 4S USB-C to 8.4V 12.6V 16.8V (4S 4A) Step-Up Boost LiPo Polymer Li-Ion Charger Board 7.4V 11.1V 14.8V 18650 Lithium Battery Boost Module Type-C (3S BMS 4A)

Parameters: 2-Cell(2S) 8.4V Version: Input voltage: DC 3-6V(Recommend DC 3.7V 5V) Input current: 1A(1A Version);2A(2A Version);4A(4A Version) Charging voltage: 8.4V Charging current: 0.55A(1A Version);1.1A(2A Version);2.2A(4A Version) 3-Cell(3S) 12.6V Version: Input voltage: DC 3-6V(Recommend DC 3.7V 5V) Input current: 1A(1A Version);2A(2A Version);4A(4A Version) Charging voltage: 12.6V Charging current: 0.37A(1A Version);0.74A(2A Version);1.48A(4A Version) 4-Cell(4S) 16.8V Version: Input voltage: DC 3-6V(Recommend DC 3.7V 5V) Input current: 1A(1A Version);2A(2A Version);4A(4A Version) Charging voltage: 16.8V Charging current: 0.28A(1A Version);0.56A(2A Version);1.12A(4A Version) Features: Switching Frequency up to 1MHz Quasi-CV mode to Compensate for the Voltage Loss on Battery Internal Resistance and Trace Resistance Automatic Recharge Protection for Battery Voltage Being Low than Input and Short Battery Good adaptability to Input Supply with Limited Driving Capability Battery Overvoltage Protection Led indicator: “CR” LED is charge status indicator “OK” LED is fully charged OR Constant voltage mode; Operating Ambient Temperature－40 Celsius degrees to ＋85 Celsius degrees Size 39mm x 18mm x 6.3mm Weight: 5g