2x18650 Lithium Battery Shield V8 Power Expansion Board with Micro USB Charging, Dual Output 5V/3A & 3V/1A, USB-A Port, On/Off Switch, Arduino ESP32 ESP8266 Compatible

This 2x18650 Lithium Battery Shield V8 is a compact mobile power expansion board designed to turn two standard 18650 Li‑ion cells into a convenient, regulated power source for electronics projects. It is commonly used with Arduino-compatible boards, ESP32/ESP8266 WiFi modules, sensors, and other 5V/3.3V devices that benefit from portable operation. The board integrates battery holders, charging input, and multiple power outputs so you can prototype quickly without building a separate battery pack and regulator stage.

The shield is built around a dual-cell battery holder footprint and onboard power management circuitry. Two 18650 cells are installed in the holders (observe polarity markings on the PCB). The module provides two labeled regulated rails: a 5V output (marked up to 3A) and a 3V output (marked up to 1A). These ratings reflect the board’s intended capability; actual continuous current can vary by module revision, thermal conditions, battery internal resistance, and the quality of the cells used. For high-current loads, ensure adequate ventilation, short/thick wiring, and verify voltage stability under load.

A Micro USB port is provided for power input/charging. Depending on the specific V8 revision, the Micro USB may be used to charge the installed cells and/or power the system while charging (power-path behavior varies by design—check datasheet or PCB markings if your application requires uninterrupted output during charging). The board also includes a USB-A port typically connected to the 5V rail for powering external devices. A slide switch allows you to disconnect/enable the output side for safer integration and reduced idle drain when not in use.

Because Li‑ion cells can deliver high current, correct installation and basic battery safety are essential: use matched cells of the same type/capacity/age, avoid mixing old and new cells, and do not use damaged cells. If your project is sensitive to noise or brownouts (common with WiFi transmit bursts on ESP32/ESP8266), add local decoupling near the load and validate peak current behavior.

• Battery type: 18650 Li‑ion rechargeable cells (2 slots)
• Battery quantity supported: 2 cells (cells not included)
• Output rails (as labeled on module):
• 5V output: up to 3A
• 3V output: up to 1A
• Charging / input connector: Micro USB (input/charging behavior varies by module revision; verify before deployment)
• Output connector: USB-A port (typically 5V rail; confirm with PCB labeling)
• Power control: Onboard slide ON/OFF switch
• Compatibility: Suitable for Arduino-compatible boards, ESP32, ESP8266, and general 5V/3.3V electronics (ensure your device voltage requirements match the selected output)
• Protections: Varies by module revision (some versions include charge/protection IC features; check datasheet/PCB markings)

• Portable Arduino/ESP32/ESP8266 power supply for IoT prototypes and demos
• Battery-backed sensor nodes, data loggers, and environmental monitoring stations
• Small robotics projects requiring a compact 5V rail for controllers and peripherals
• DIY power bank style builds for powering 5V modules via USB-A
• Field testing rigs where Micro USB charging input simplifies recharging

• Confirm your load voltage: use the 5V rail for 5V boards/peripherals and the 3V rail for 3.3V-only devices; do not feed 5V into 3.3V-only pins.
• Validate current headroom: WiFi modules can draw short peaks; measure voltage at the load during peak activity and add bulk capacitance if needed.
• Charging considerations: if you need simultaneous charge-and-run behavior, verify your specific board revision supports it without output dropouts.
• Use matched, quality 18650 cells and install with correct polarity; remove cells before soldering or modifying wiring.
• For high current, keep leads short and use thicker wire to reduce voltage drop and heating.

2x18650 Battery Shield V8 Power Expansion Board (1pc)