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2USB Power Bank Module

Specification	Details
Input Interface	Micro USB (5V 1A)
Output Interface	Dual USB Type-A (5V 1A & 2.1A)
Battery Compatibility	3.7V Lithium (18650 / Li-Po)
Charge Cut-off	4.2V ± 1%
Boost Efficiency	Up to 90%
Protection	Overcharge, Over-discharge, Overload
Dimensions	69mm x 32mm x 8mm

Price

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₹ 101.69

(Tax included)

Barcode: 591153

Product Description

The 2-USB Power Bank Module is engineered to simplify the construction of high-capacity portable chargers. It supports simultaneous charging and discharging, allowing you to charge your phone while the power bank itself is plugged into a wall adapter. The board features a smart controller that manages the CC/CV (Constant Current/Constant Voltage) charging profile for the battery and then boosts that voltage to a stable 5V for the USB outputs. It typically includes a built-in flashlight LED that can be toggled via an onboard push-button.

Key Features

Dual Output Design: Features two USB ports, typically labeled for 1A (standard charging) and 2.1A (fast charging for tablets).
Integrated Protection: Unlike basic boost converters, this includes a Battery Management System (BMS) to prevent the cells from dropping below dangerous voltage levels.
Intelligent Auto-Sleep: Automatically shuts down the boost circuit when no load is detected, significantly extending the shelf life of your battery pack.
4-Level LED Indicator: Most versions include four blue LEDs to show the remaining battery capacity (25%, 50%, 75%, 100%).
High Efficiency: Utilizes a synchronous rectification boost circuit to minimize heat and maximize the energy delivered to your devices.

Technical Details

Battery Connection: Large B+ and B- pads for easy soldering of battery wires.
Flashlight: Includes a high-brightness 5mm LED for emergency lighting.
Push Button: Single click to check battery level; double-click or long-press to toggle the LED flashlight.

Prototyping and Engineering Tips from Robogears

Parallel Batteries Only: You can connect multiple 18650 cells to increase capacity, but they must be in parallel (B+ to B+, B- to B-). Connecting batteries in series will provide 7.4V+, which will instantly destroy the module.
The "First Charge" Wake-up: When you first solder the batteries, the module might show 0V at the USB ports. Simply plug a Micro USB charger into the input port for a few seconds to activate the protection IC and "wake up" the board.
Wire Gauge Matters: Use thick, short wires for the battery connections. At a 2A output, the battery can draw over 3A from the cells; thin wires will cause a voltage drop that triggers the "low battery" shutdown prematurely.
Heat Dissipation: While efficient, the board can get warm during 2.1A fast charging. Ensure your 3D-printed enclosure has small vent holes to allow for natural convection.

Package Includes

1 x 2-USB Power Bank Module (134N3P or equivalent)

Disclaimer

Ensure battery polarity is correct before soldering. Reversing the B+ and B- connections will cause permanent damage to the main controller chip.

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