DIY 18650 21700 3.7V Lithium Battery Step-Up Boost Lo Polymer Li-Ion Charger Multi-Cell 2S 3S 4S 5V Type-C To 8.4V 12.6V 16.8V

Descrtion: 1: Wide range of applications 2: Small size 3: a variety of options 4: Simple to use 5: stable performance 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) 3S 12.6V version: Input voltage: DC 3-6V (recommended 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) 4S 16.8V version: Input voltage: DC 3-6V (recommended 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) Switching frequency up to 1MHz Quasi-CV Mode to Compensate for Voltage Lo on Battery Internal Resistance and Trace Resistance Automatic recharge Battery voltage below input and short-to-battery protection Good adaptability to input power with limited drive capability Battery overvoltage protection LED indicator: ''CR'' LED is charging status indicator ''OK'' LED is fully charged or in constant voltage mode; Working ambient temperature -40°C to +85°C Weight: 5g Application: Notebook Li-on lithium battery 18650 Mobile phone solar charging Audio equment Portable device Electric fan TYPE-C charging equment, etc. Package included: 1* Polymer Li-ion Charger

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