Product Features:
1. High safety performance and wide application;
2. Simple to understand, easy to operate quasi-CV mode compensation battery internal resistance voltage loss and alignment resistance battery
3. Battery over-voltage protection, automatic charging.
4. Protection voltage below input and battery short circuit.
5. Good adaptability to the input power supply, limited drive capacity.
6. A variety of options, customers choose their needs according to different needs.
7. Applications: PDA, MP3 MP4 player, game console, notebook, cell phone etc.

Product Parameters:
2-Cell(2S) 8.4V version:
Input voltage: DC 3-6V (recommended 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)
Switching frequency up to 1MHz
LED indicator: "CR" LED is the charging status indicator; "OK" LED fully charged or constant voltage mode
Working ambient temperature: -40°C to +85°C
Dimensions: 37mm x 18mm x 6.3mm/1.45in x 0.7in x 0.2in
Weight: 5g

Package Includes:
2PCS 2S 4A TypeC USB Lithium Battery Step-up Charging Board