3S 18650 Lithium Battery Capacity Indicator Module Level Tester LED

Product Description

The 3S LED Capacity Indicator is a compact, plug-and-play module designed for seamless integration into portable power projects. It uses an intelligent voltage detection circuit to estimate the remaining energy in your battery pack. The display logic is simple: the first LED lights up at 3.1V, the second at 6.3V, the third at 9.4V, and the fourth at a full 12.6V. This provides a reliable, non-intrusive way to ensure your devices—like drones, e-bikes, or portable speakers—never run out of power unexpectedly.

Key Features

• Intuitive LED Feedback: Clearly indicates capacity levels so you can manage battery usage without needing a multimeter.

• Reverse Connection Protection: Features a safety circuit that prevents the module from burning out if the positive and negative wires are accidentally swapped.

• Minimal Power Draw: With a static current consumption of only 2-3mA, it has virtually no impact on the overall runtime of your battery pack.

• Wide Compatibility: Works perfectly with any 3S lithium chemistry, including 18650 cylindrical cells and polymer (Li-Po) packs.

• Ultra-Slim Profile: At just 10mm wide, it can be mounted on narrow panels or tucked into slim enclosures alongside your BMS.

Technical Details

• Connection: Simple 2-wire hookup (Red to Battery +, Black to Battery -).

• LED Color: Often features a blue or red outline with green segments for high visibility.

• Auto-Detection: Automatically senses the voltage levels upon connection; no calibration required.