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🎓 Trusted by Engineering Students, Makers & Innovators Across India
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  2. ⚡ Power & Management
  3. 🪫 Cell Holders & Chargers
  4. Dual 18650 Battery Charger - 3.7V Li-ion USB Universal Charger
  5. 🪫 Cell Holders & Chargers
Pricelist: Retail Price (B2C) Pricelist
Pricelist: Retail Price (B2C) Pricelist
Dual 18650 Battery Charger - 3.7V Li-ion USB Universal Charger

Dual 18650 Battery Charger - 3.7V Li-ion USB Universal Charger

SpecificationDetails
Compatible Battery18650 Li-ion (Rechargeable)
Input Voltage5V DC (Standard USB)
Output Voltage3.7V - 4.2V DC
Charging Slots2 Independent Slots
Charging Current~500mA to 1000mA (Total)
IndicatorLED Status (Red/Green or Red/Blue)
                                 Price

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₹ 144.07 ₹ 144.07
(Tax included)

Barcode: 6431060

Product Description

The 3.7V Dual 18650 Rechargeable Lithium Battery Charger is a compact and efficient charging station designed for the most common high-capacity cylindrical Li-ion cells. Featuring two independent charging bays, this module allows you to charge one or two 18650 batteries simultaneously. The charger is powered via a standard USB interface, making it highly versatile for use with mobile phone adapters, power banks, or computer USB ports. Each slot is engineered with a spring-loaded slider to ensure a tight electrical connection with various lengths of 18650 cells, including both flat-top and button-top variants.

Key Features

  • Dual-Slot Independent Charging: Each bay operates autonomously, allowing you to charge batteries of different remaining capacities without affecting each other.

  • Smart LED Indicators: Provides instant visual feedback; typically turns Red during active charging and switches to Green (or Blue) once the battery reaches its full 4.2V capacity.

  • USB-Powered Portability: The 5V input allows for easy charging on the go, compatible with almost any modern DC power source.

  • Safety Protection Circuitry: Includes basic over-charge protection to prevent the lithium cells from exceeding their safe voltage limit, which is critical for battery longevity.

  • Universal 18650 Fit: The robust spring mechanism accommodates the slight size differences between protected and unprotected 18650 cells.

Technical Details

  • Plug Type: USB (Cable included/integrated depending on variant).

  • Construction: Fire-retardant ABS plastic housing.

  • Termination Voltage: Precise 4.2V ± 1% cutoff.

Prototyping and Engineering Tips from Robogears

  • The "4.2V Full" Rule: While these batteries are labeled as "3.7V" (nominal voltage), a healthy, fully charged Li-ion battery should measure exactly 4.2V on a multimeter. If your charger stops at 4.1V, it is a safety feature to extend cycle life; if it goes above 4.25V, disconnect it immediately.

  • Polarity Check: CRITICAL: Most basic 18650 chargers do not have "Reverse Polarity Protection." Always ensure the positive (+) end of the battery (the end with the small indent or button) matches the (+) mark on the charger. Inserting them backward can cause the charger or the battery to overheat rapidly.

  • USB Power Source: For the fastest charging speeds, use a USB wall adapter rated for at least 2A (2000mA). If you plug the charger into a low-power laptop USB 2.0 port, the charging time will be significantly longer because the port cannot supply enough current for two cells.

  • Heat Monitoring: It is normal for the batteries to feel slightly warm during the bulk charging phase. However, if a battery becomes too hot to touch, the internal resistance of the cell may be too high (indicating an old or damaged battery), and it should be disposed of safely.

  • Avoid "Deep Discharge": To keep your 18650s healthy, try to recharge them before they drop below 3.0V. Standard chargers may sometimes fail to "wake up" a battery that has been drained down to 0V.

Package Includes

  • 1 x 3.7V Dual 18650 Rechargeable Lithium Battery Charger

Disclaimer: Never leave lithium batteries charging unattended. Do not attempt to charge non-rechargeable batteries (like Alkaline or Zinc-Carbon) in this device. Ensure the charger is kept away from flammable materials and moisture. Use only with high-quality 18650 cells to ensure safety and performance.

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