Li-ion Battery Charger 8.4V 2A

This lithium-ion battery charger is typically used for single-cell or multi-cell battery packs (like 18650 cells), with different models outputting voltages such as 12.6V (for 3S packs) or 4.2V (for 1S packs).

Operation and Indicators

The charger uses a constant current and constant voltage (CC/CV) charging scheme. Status is indicated by the LEDs on the front.

• Red Light: Actively charging the battery.
• Green Light: The battery is fully charged or disconnected.
• Flashing Red/Green: Often indicates a connection issue, a bad battery, or an unstable power source.

Typical Specifications (4.2V Models)

• Output Voltage: Fixed at 4.2V with approximately ±1% accuracy for charging a single 3.7V nominal Li-ion cell.
• Charge Current: Common models support current ranges from 500mA to 2A, though some ICs can be programmed as low as 100mA.
• Trickle Charge: If a battery is deeply discharged (below ~2.9V), the charger provides a low trickle current to safely precondition the cell.
• Automatic Termination: The charging cycle automatically stops when the battery reaches its full 4.2V float voltage and the charging current drops below a set threshold (typically C/10 or 10% of the programmed current).