2S 18650 Li-Po Lithium Battery Capacity Indicator Module

2S 18650 Li-Po Lithium Battery Capacity Indicator Module

The 2S 18650 Li-Po Lithium Battery Capacity Indicator Module is a compact and easy-to-use battery level display designed to provide a quick visual indication of the remaining charge in a 2S lithium battery pack. It is suitable for battery packs with an operating voltage range of approximately 6.6V to 8.4V, making it compatible with 2S 18650 Li-ion, Li-Po, and similar rechargeable battery configurations.

The module features a clear digital display that provides a more convenient and intuitive way to monitor battery capacity compared with simple LED indicators. When the battery is fully charged, the display segments illuminate completely, while the displayed level changes as the battery voltage decreases.

To use the module, simply connect its positive and negative terminals to the corresponding positive and negative terminals of the battery being monitored. The digital display will then indicate the approximate real-time battery level based on the battery voltage.

Its compact size makes it suitable for RC vehicles, robotics projects, portable electronics, DIY battery packs, electric equipment, and other battery-powered applications. The module also features reverse-connection protection to help prevent damage if the battery polarity is accidentally connected incorrectly.

Features

• Digital battery capacity indicator module
• Designed for 2S lithium battery packs
• Suitable for 18650 Li-ion and Li-Po battery packs
• Input voltage range: 6.6V–8.4V
• Provides a clear digital battery-level indication
• More intuitive than basic LED battery indicators
• Displays the approximate real-time battery level
• Full battery indication when the display is completely illuminated
• Reverse-connection protection
• Compact and lightweight design
• Simple two-wire battery connection
• Easy to install and use
• Suitable for DIY battery packs
• Useful for RC and robotics applications
• Suitable for portable electronic equipment
• Can be used with compatible rechargeable battery systems

Specifications

Parameter	Specification
Product Type	2S Battery Capacity Indicator Module
Compatible Battery	2S Li-ion / Li-Po Battery Pack
Suitable Battery	18650 and Similar Lithium Battery Packs
Input Voltage	6.6V–8.4V
Display Type	Digital Segment Display
Display Colour	Red Outline / Blue Display
Full Battery Display	All Segments Illuminated
Protection	Reverse-Connection Protection
Length	Approximately 41mm
Width	Approximately 20mm
Weight	Approximately 3g
Application	Battery Level Monitoring

Working Principle

The module monitors the voltage of the connected 2S lithium battery pack and uses the measured voltage level to provide an approximate indication of the remaining battery capacity.

When the battery is connected, the module powers its digital display directly from the battery. As the battery voltage changes during charging or discharging, the displayed battery level changes accordingly.

For a fully charged 2S lithium battery pack, the voltage can reach approximately 8.4V, and the display will show the full-level indication. As the battery voltage decreases, fewer display segments are illuminated to indicate a lower battery level.

The module is a battery voltage indicator, so the displayed percentage should be treated as an approximate indication rather than an exact measurement of remaining battery capacity.

Using the Module

1. Identify the positive and negative terminals of the 2S battery pack.
2. Connect the module’s positive terminal to battery positive.
3. Connect the module’s negative terminal to battery negative.
4. The digital display will turn on automatically.
5. Observe the display to check the approximate battery level.

Always verify the battery polarity before connection, even though the module includes reverse-connection protection.

Applications

• 2S 18650 battery packs
• Li-Po battery packs
• RC cars
• RC boats
• DIY robotics
• Robot battery monitoring
• Portable electronics
• Electric equipment
• Battery-powered projects
• DIY rechargeable battery packs
• Embedded electronics
• Mobile robotic platforms
• Electric vehicle projects
• Hobby electronics
• Battery voltage monitoring
• Educational electronics projects

Package Includes

• 1 × 2S 18650 Li-Po Lithium Battery Capacity Indicator Module

Product Disclaimer

The displayed battery level is an approximate indication based primarily on battery voltage and should not be considered an exact measurement of remaining battery capacity. Actual battery capacity depends on battery chemistry, cell condition, load, temperature, discharge characteristics, and other factors.

This module is designed for 2S lithium battery packs within the specified 6.6V–8.4V range. Do not connect it to battery packs with voltages outside the specified range.

The module is an indicator only and is not a battery charger, protection circuit, BMS, or balancing module. Use an appropriate charger and battery-management/protection system for the connected battery pack where required.

Product images are for illustrative purposes only. Actual product colour, PCB layout, display appearance, dimensions, or component placement may vary slightly depending on manufacturing batch.

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