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Pricelist: Retail Price (B2C) Pricelist
Dual Micro USB 3.7v to 5V 2A Power Bank DIY 18650

Dual Micro USB 3.7v to 5V 2A Power Bank DIY 18650

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SpecificationDetails
Input InterfaceMicro USB (5V 1A)
Output InterfaceDual USB Type-A (5V 1A & 5V 2A)
Battery Voltage3.0V – 4.2V (Lithium-ion / Li-Po)
Conversion Efficiency~85% to 90%
Charging Cut-off4.2V ± 1%
Over-discharge Cut-off~2.9V
Dimensions68mm x 34mm x 9mm
Price
₹ 101.69 ₹ 101.69
(Tax included)

Product Description

The Dual USB Power Bank Module is the core component needed for DIY energy storage projects. It features two USB output ports, typically optimized for different charging speeds: one 1A port for standard devices and one 2A port for faster charging or power-hungry tablets. The board handles the complex Constant Current/Constant Voltage (CC/CV) charging profile for your batteries and includes a built-in LED flashlight for added utility.

Key Features

  • Dual USB Output: Provides two separate charging channels, allowing you to charge two devices simultaneously.

  • Intelligent Protection: Built-in safeguards protect your batteries from overcharging, over-discharging, and short circuits.

  • LED Status Indicators: Features a 4-level LED display (25%, 50%, 75%, 100%) to provide real-time battery capacity feedback.

  • Auto-Sleep Function: Automatically enters a low-power standby mode when no device is connected, preserving your battery's charge.

  • Plug-and-Play: Includes a pre-mounted Micro USB input port, making it compatible with standard wall chargers.

Technical Details

  • Battery Connection: Large B+ and B- pads for easy soldering of your battery pack.

  • Flashlight Control: A single push-button toggles the battery status check; a double-click or long-press usually activates the onboard LED flashlight.

Prototyping and Engineering Tips from Robogears

  • Parallel Wiring Only: You can connect multiple 18650 cells to increase the total capacity (mAh), but they must be in parallel. Connecting batteries in series will deliver 7.4V+, which will instantly destroy the module's IC.

  • The "First Charge" Reset: When you first connect your batteries, the module may not output power immediately. Plug a Micro USB charger into the input port for a few seconds to "wake up" the protection circuit.

  • Wire Thickness: At a 2A output, the current drawn from the battery can be quite high. Use thick, short copper wires for the battery-to-board connection to avoid voltage drops that could cause the module to shut down prematurely.

  • Load Requirements: If you are powering a low-current device like an Arduino, the module's "Auto-Off" feature might trigger because the current draw is too low. You may need a small "dummy load" to keep the module active.

Package Includes

  • 1 x Dual Micro USB 3.7V to 5V 2A Power Bank DIY Module

Disclaimer

Always verify battery polarity before soldering. Reversing the positive and negative connections will cause permanent damage to the controller chip.