2PCS Multi-Cell 2S 3S 4S Type-C USB Boost Converter to 8.4V 12.6V 16.8V Step-Up Power Module LiPo Polymer Li-Ion Charger Protection Board (3S 2A)

Product description Led indicator "CR" LED is charge status indicator; "OK" LED is fully charged OR Constant voltage mode.
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-Cel (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) Feature: Diverse choices, customers can choose what they need according to different needs 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 Operating Ambient Temperature- 40°C to + 85°C
Applications: PDA/ MP3 Players/ MP4 Players/ Digital Cameras/ Bluetooth Applications/ Game Players Notebook/ li-on li-po Lithium Battery 18650/ Mobile phone/ Solar charging/ Audio equipment Portable Devices/ POS/ Electric Fan/ TYPE-C charging equipment ect.