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