LED
LCD
Product Description
This advanced Dual USB Power Bank DIY Module is an all-in-one step-up booster and charging circuit upgraded with an integrated high-contrast LCD backlight display screen. Designed for building custom high-performance portable power banks, it is compatible with both 3.7V Lithium-Ion (18650) and Lithium-Polymer (Li-Po) cells connected in parallel. The module cleanly boosts variable battery voltages to a stable 5V DC output through two independent USB ports providing dedicated 1A and 2A current paths. The standout feature is the onboard LCD panel, which provides precise real-time diagnostic reporting by displaying exact battery percentage status and active input/output connection states. Complete with built-in protection against overcharging, over-discharging, and short-circuits, it offers a highly professional and interactive foundation for portable power systems, IoT nodes, and bench testing setups.
Pinout / Layout Connections
The board features clearly defined surface solder pads and integrated physical connection ports:
Battery Input Terminals:
B+ Solder Pad: Connects directly to the positive terminal of the parallel 3.7V lithium battery bank.
B- Solder Pad: Connects directly to the negative terminal of the parallel 3.7V lithium battery bank.
Output / Input Interfaces:
USB Port 1 (OUT 5V/1A): Type-A USB socket optimized for standard electronic accessories and lower-drain microcontrollers.
USB Port 2 (OUT 5V/2A): Type-A USB socket optimized for fast-charging mobile hardware and single-board electronics.
Micro-USB / Type-C Input Port (IN 5V): Onboard input port utilized to safely recharge the connected battery bank from a standard 5V wall adapter.
LCD Display Interface: Positioned on the upper side of the module, providing real-time alphanumeric stats for capacity percentage and connection paths (
IN,OUT 5V 1A,OUT 5V 2A).
Applications
Smart DIY Power Banks: Assembling premium portable power packs featuring precise visual percentage monitoring.
Prototyping & Bench Power: Providing mobile, diagnostic-friendly 5V power sources for field-testing Arduino or ESP32 development boards.
Portable Hardware Diagnostics: Real-time current distribution and voltage status validation for low-power mobile robotic platforms.
Custom Emergency Systems: Engineering smart backup power equipment with reliable digital user interfaces.
Technical Specifications
| Parameter | Value / Specification |
| Module Type | DC-DC Step-Up Booster, Li-ion Charger & LCD Fuel Gauge |
| Supported Chemistries | 3.7V Lithium-Ion (18650) / Lithium-Polymer (Li-Po) |
| Battery Input Voltage | DC 3.0 V to 4.2 V |
| Charging Input Interface | 5V Micro-USB or Type-C (Variant dependent) |
| Output Voltage | DC 5.0 V ($\pm 5\%$) |
| Output Current | 1.0 A (Port 1) & 2.0 A (Port 2) |
| Display Type | LCD Screen with Blue Backlight |
| Protection Systems | Overcharge, over-discharge, overcurrent, and short-circuit protection |
| Status Readout | 0% to 100% Battery Fuel Gauge, Input/Output status indicators |
