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Pricelist: Retail Price (B2C) Pricelist
3S 18650 Lithium Battery Capacity Indicator Module Level Tester LED

3S 18650 Lithium Battery Capacity Indicator Module Level Tester LED

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SpecificationDetails
Battery Type3S Lithium-Ion / Li-Po (11.1V - 12.6V)
Display Type4-Level LED Bar Graph
Static Consumption2.3mA (Negligible)
Input Voltage Range9.0V to 12.6V
ProtectionIntegrated Reverse Polarity Safeguard
Dimensions50mm x 10mm x 10mm
Weight~15g
Price
₹ 80.51 ₹ 80.51
(Tax included)

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.

Prototyping and Engineering Tips from Robogears

  • Momentary Switch Integration: To maximize battery life, it is highly recommended to wire this module through a momentary push-button. This allows you to check the battery status only when needed rather than having the LEDs stay on constantly.

  • Voltage Sag Awareness: Be aware that the display may drop one segment while the battery is under a heavy load (like a motor starting). For the most accurate reading of true capacity, check the indicator while the device is "at rest."

  • BMS Synergy: This indicator should be wired in parallel with your 3S BMS output or directly to the battery terminals. It does not replace a BMS; it only provides the visual feedback that most protection boards lack.

  • Heat & Mounting: The module generates almost no heat, making it safe to mount against plastic or 3D-printed parts. Use a small amount of double-sided tape or hot glue on the corners of the PCB for secure mounting.

Package Includes

  • 1 x 3S 12.6V 18650 Lithium Battery Capacity Indicator Module

Disclaimer

This module is strictly for 3S (12.6V max) Lithium-ion/Polymer batteries. Connecting it to a 4S pack or a 12V lead-acid battery may result in inaccurate readings or damage due to different voltage curves.