3S 18650 Li-Po LithiumBattery Capacity Indicator Module

3S 18650 Li-Po Lithium Battery Capacity Indicator Module – Visual Bar Display Battery Meter

The 3S 18650 Li-Po Lithium Battery Capacity Indicator Module is a compact and easy-to-use battery level monitoring module designed to provide a quick visual indication of the approximate charge status of 3S lithium battery packs. It is suitable for 18650 lithium-ion cells, Li-Po battery packs, and other compatible rechargeable battery configurations used in RC vehicles, robotics, portable power systems, and DIY electronics projects.

The module features an intuitive LED bar-style display that allows users to check the battery level at a glance without requiring a multimeter or digital voltage display. As the battery voltage changes during charging and discharging, the indicator provides a corresponding visual representation of the approximate battery status.

Designed specifically for 3-cell series (3S) battery configurations, the module is suitable for commonly used lithium battery packs. It can be connected directly across the positive and negative terminals of the battery pack, allowing the indicator to operate from the battery being monitored without requiring a separate power supply.

Its simple plug-and-play design makes installation straightforward. Connect the positive and negative terminals of the module to the corresponding battery terminals, and the LED bar display will indicate the battery’s approximate charge level.

The module is useful for DIY power supplies, RC cars, RC boats, drones, electric vehicles, robotics, battery packs, portable power systems, solar projects, and other battery-powered equipment where a quick visual battery indication is required.

Features

• 3S lithium battery capacity indicator module
• Designed for 3-cell series battery packs
• Suitable for 18650 lithium-ion batteries
• Compatible with suitable Li-Po battery packs
• Easy-to-read LED bar display
• Provides quick visual battery-level indication
• Simple two-wire connection
• Plug-and-play operation
• Powered directly from the monitored battery
• Compact and lightweight design
• Suitable for DIY battery packs
• Useful for RC vehicles and robotics
• Suitable for portable power systems
• Useful for battery-powered electronics
• Easy to install and operate

Specifications

Parameter	Specification
Product Type	3S Battery Capacity Indicator Module
Battery Configuration	3S / 3-Cell Series
Compatible Battery	18650 Li-ion, Li-Po and Compatible Lithium Packs
Display Type	LED Bar Display
Display Function	Approximate Battery Level
Connection	Battery Positive and Negative
Operation	Direct Battery Powered
Application	Battery Monitoring & Capacity Indication

Working Principle

The module monitors the voltage of the connected 3S battery pack and converts the measured voltage level into a visual LED bar indication.

When the battery voltage is high, more LED segments are illuminated to indicate a higher charge level. As the battery voltage decreases during use, fewer segments are displayed, providing a quick indication that the battery is becoming discharged.

The module is intended as a visual battery-level indicator, so the displayed level should be considered an approximate indication rather than an exact measurement of remaining battery capacity. Actual battery capacity can vary depending on battery chemistry, cell condition, load, temperature, discharge characteristics, and other factors.

How to Use

1. Connect the positive terminal of the module to the positive terminal of the 3S battery pack.
2. Connect the negative terminal of the module to the negative terminal of the battery pack.
3. Power is supplied directly from the battery being monitored.
4. Observe the LED bar display to check the approximate battery level.

Always verify the battery polarity before connecting the module.

Applications

• 3S 18650 battery packs
• Li-Po battery monitoring
• DIY power supply projects
• RC cars
• RC boats
• RC aircraft
• Drones and quadcopters
• Robotics projects
• Electric vehicles
• Portable power stations
• Power banks
• Solar battery systems
• Electric tool battery packs
• Battery-powered equipment
• DIY rechargeable battery packs
• Battery monitoring systems
• Embedded electronics projects
• Educational electronics projects

Package Includes

• 1 × 3S 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.

This module is intended for 3S battery configurations. Verify the battery voltage and configuration before connecting the module. Do not connect it to an unsuitable battery pack or voltage outside the module’s supported range.

The module is a battery indicator only and does not function as a battery charger, BMS, cell balancer, or battery protection circuit. Use an appropriate charging and protection system with rechargeable lithium batteries.

Product images are for illustrative and representational purposes only. The actual product may vary slightly in colour, dimensions, LED appearance, PCB layout, or component placement depending on the manufacturing batch.

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