Li-ion Single Battery Charger Plug-in Type

The Li-ion Single Battery Charger Plug-in Type is a compact AC-powered battery charger designed specifically for charging one 3.7V lithium-ion rechargeable battery. It plugs directly into a wall power outlet and provides a safe, controlled charging process using the Constant Current/Constant Voltage (CC/CV) charging method. This charger is commonly used for charging 18650, 14500, 16340, 17670, and other compatible 3.7V lithium-ion rechargeable batteries, making it ideal for flashlights, portable electronics, battery-powered devices, robotics, IoT projects, and DIY electronics.

The charger consists of an AC input plug, AC-to-DC power conversion circuit, charging control IC, CC/CV charging circuit, battery charging slot, metal charging terminals, status LED indicators, and a protective insulated plastic enclosure. The battery slot is designed with spring-loaded contacts to securely hold a single lithium-ion battery during charging.

The working principle of the Li-ion Single Battery Charger Plug-in Type begins when the charger is connected to an AC power outlet (100–240V AC, 50/60Hz). The internal power supply converts the AC mains voltage into a regulated DC charging voltage. The charger first supplies a constant current (CC) to rapidly charge the battery. As the battery voltage approaches 4.2V, the charger automatically switches to the constant voltage (CV) charging mode, gradually reducing the charging current until the battery is fully charged. Once charging is complete, the charger either stops charging or enters a trickle or standby mode, depending on the charger design.

Typical specifications include:

• Product Type: Lithium-Ion Battery Charger

• Battery Compatibility: Single 3.7V Li-ion Rechargeable Battery

• Supported Battery Sizes: 18650, 14500, 16340, 17670, and other compatible cylindrical Li-ion cells

• Input Voltage: 100–240V AC, 50/60Hz

• Charging Voltage: 4.2V DC ±1%

• Charging Method: Constant Current / Constant Voltage (CC/CV)

• Charging Channels: 1

• Mounting Type: Plug-in Wall Charger

• Status Indicator: LED Charging Indicator

The charger typically uses LED indicators to display the charging status:

• Red LED: Battery is charging.

• Green LED: Battery is fully charged or no battery is inserted.

The charger includes several built-in safety features, such as:

• Overcharge protection

• Over-current protection

• Short-circuit protection

• Reverse polarity protection (on supported models)

• Over-voltage protection

• Thermal protection

These protection features help extend battery life and improve charging safety.

The Li-ion Single Battery Charger Plug-in Type is suitable for charging batteries used in:

• LED Flashlights

• Emergency Lights

• Portable Fans

• Power Banks (replaceable battery models)

• Wireless Devices

• Robotics Projects

• Arduino Projects

• IoT Devices

• Embedded Systems

• Battery Packs

• Portable Electronic Equipment

• DIY Electronics

The applications of the Li-ion Single Battery Charger Plug-in Type include charging lithium-ion batteries for portable electronics, robotics, IoT devices, embedded systems, flashlights, wireless sensors, educational electronics, laboratory equipment, engineering projects, battery maintenance, prototype development, and DIY electronic projects.

The advantages of the charger include compact plug-in design, universal 100–240V AC input, automatic CC/CV charging, intelligent charging control, LED charging status indication, built-in safety protections, lightweight construction, easy operation, reliable charging performance, compatibility with multiple lithium-ion battery sizes, and long service life.

Safety Precautions:

• Charge only 3.7V lithium-ion rechargeable batteries.

• Do not attempt to charge non-rechargeable batteries.

• Insert the battery with the correct polarity (+ and −).

• Use the charger indoors in a dry environment.

• Disconnect the charger after charging is complete.

• Do not use damaged batteries or damaged chargers.

• Keep the charger away from water, excessive heat, and direct sunlight.

In conclusion, the Li-ion Single Battery Charger Plug-in Type is a reliable and efficient charger designed for safely charging a single 3.7V lithium-ion rechargeable battery. Its intelligent CC/CV charging method, built-in protection features, LED status indication, and compatibility with common lithium-ion battery sizes make it an excellent choice for portable electronics, robotics, IoT devices, embedded systems, educational electronics, and DIY engineering projects.