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Universal Single Battery Charger for 3.7V Li-ion Cells (18650, 26650, 14500, 16340)

Component	Specification
Supported Chemistry	Lithium-Ion (Li-ion)
Compatible Cell Sizes	18650, 26650, 14500, 16340 (RCR123), 10440
Input Voltage	AC 100V – 240V, 47-63Hz
Output Voltage	DC 3.7V – 4.2V
Charging Current	450mA to 500mA
Termination Voltage	4.2V ± 1%

Price

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₹ 72.03

(Tax included)

Barcode: 71149

Product Description The Universal Single-Slot Li-ion Battery Charger is a versatile charging solution for a wide range of 3.7V cylindrical lithium batteries. Featuring a spring-loaded adjustable slider, it can securely hold and charge cells of varying lengths, from the small 16340 to the large 26650. The internal circuitry utilizes an intelligent CC/CV (Constant Current/Constant Voltage) charging profile, ensuring that each cell is charged safely and efficiently to its peak voltage of 4.2V, significantly extending the overall lifespan of your batteries.

Key Features

Adjustable Spring Slider: Automatically adapts to different battery heights and diameters.
Smart LED Indicator: Features a dual-color LED (Red: Charging / Green: Full or Standby) for easy status monitoring.
Safety Termination: Built-in overcharge protection stops current flow once the battery reaches 4.2V.
Compact & Portable: Features a space-saving design with a built-in AC plug, ideal for travel or field use.
Wide Input Range: Compatible with global voltage standards (100V-240V AC).

Technical Details

Plug Type: Indian/European Standard 2-pin
Charging Logic: Microprocessor-controlled CC/CV
Material: Fire-retardant ABS Plastic
Dimensions: Approx. 100mm x 40mm x 30mm
Weight: Approx. 45g

Prototyping and Engineering Tips from Robogears
Polarity Check: Always verify the + (Positive) and - (Negative) markings on the charger before inserting the cell. While most units have basic protection, reverse polarity can damage the internal charging IC.
Recovery of "Dead" Cells: If a Li-ion battery has dropped below 2.5V, many smart chargers will not detect it (the LED will stay Green). You may need a specialized "recovery" charger to jumpstart such deeply discharged cells.
Charging Time Calculation: To estimate the charging time, use the formula:
$$Time (hours) = \frac{Battery Capacity (mAh)}{Charger Current (mA)} \times 1.2$$
(The 1.2 factor accounts for the slower CV phase at the end of the cycle.)
Heat Dissipation: It is normal for the charger to feel warm during the first 80% of the charge cycle. However, if the battery becomes hot to the touch, disconnect it immediately as the cell may be faulty.
Package Includes
1 x Universal Single-Slot 3.7V Li-ion Battery Charger
Disclaimer
Images are for reference; housing style or LED placement may vary by batch. For use with 3.7V/4.2V Lithium-Ion batteries only. Never attempt to charge Alkaline, Ni-MH, or Ni-Cd batteries in this device.

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