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4S 16.8V lithium battery power display module (Blue)

SKU: FA2192-3
Compatible Battery

4S lithium-ion (14.8V nominal / 16.8V full)
Voltage Range

12.0V – 16.8V
Display Type

LED bar graph (4 levels)
Indication Levels

25% / 50% / 75% / 100%
LED Color

Blue
Power Supply

Powered by monitored battery pack
Protection

Reverse polarity protection
Module Dimensions

Compact PCB with mounting holes

The 4S 16.8V Lithium Battery Power Display Module is a compact, easy-to-use battery capacity indicator designed specifically for 4-cell (4S) lithium battery packs. It provides a clear, visual indication of remaining battery capacity using a row of blue LEDs, making it an essential accessory for battery-powered projects, RC vehicles, power banks, and portable electronics.

The module is designed for 4S lithium battery packs with a nominal voltage of 14.8V and a full charge voltage of 16.8V. It continuously monitors the total pack voltage and illuminates the appropriate number of LEDs to indicate the current charge level — typically 25%, 50%, 75%, and 100%. This allows you to quickly assess whether a battery pack needs charging without using a multimeter.

The module features high-brightness blue LEDs that provide clear visibility in various lighting conditions. The compact PCB design with mounting holes makes it easy to integrate into battery packs, RC models, and custom enclosures. The module operates directly from the battery pack it monitors, requiring no separate power supply.

Installation is simple: connect the module’s B+ and B- pads to the battery pack’s positive and negative terminals, and the LEDs will immediately indicate the charge level. The module includes reverse polarity protection to prevent damage from accidental incorrect connection.

The 4S power indicator module is widely used in RC vehicles, drone battery packs, DIY power banks, portable speakers, robotic systems, electric bicycles, solar battery banks, and any application where 4S battery status monitoring is important. It is also popular in educational projects for teaching battery management and voltage monitoring.

Whether you are building a custom 4S battery pack, maintaining a fleet of RC batteries, or adding battery status indication to a portable device, the 4S 16.8V Lithium Battery Power Display Module provides a reliable, cost-effective solution. It is suitable for individual makers, students, and businesses purchasing in bulk for product development or educational programs.

Features

  • 4S lithium battery compatibility — Designed for 4-cell 14.8V/16.8V battery packs

  • LED capacity display — Shows charge level at 25%, 50%, 75%, and 100%

  • Blue LED option — High-brightness blue LEDs for clear visibility

  • Direct battery operation — Powered by the battery pack it monitors

  • Reverse polarity protection — Prevents damage from incorrect connection

  • Compact PCB design — With mounting holes for easy integration

  • Simple installation — Connect B+ and B- to battery pack terminals

  • Wide application range — RC vehicles, drones, power banks, e-bikes, solar systems

Technical Specifications 

# Parameter Specification
1 Compatible Battery 4S lithium-ion (14.8V nominal / 16.8V full)
2 Voltage Range 12.0V – 16.8V
3 Display Type LED bar graph (4 levels)
4 Indication Levels 25% / 50% / 75% / 100%
5 LED Color Blue
6 Power Supply Powered by monitored battery pack
7 Protection Reverse polarity protection
8 Module Dimensions Compact PCB with mounting holes

Usage

Getting Started

  1. Identify the battery pack terminals — Locate the positive (+) and negative (-) terminals of your 4S lithium battery pack.

  2. Connect the module — Solder or connect the module’s B+ pad to the battery pack positive terminal and B- pad to the battery pack negative terminal. Observe correct polarity.

  3. Observe the display — The LEDs will immediately illuminate to indicate the current charge level:

    • 1 LED = 25% or less

    • 2 LEDs = 25–50%

    • 3 LEDs = 50–75%

    • 4 LEDs = 75–100%

  4. Charge as needed — When the display shows low capacity, recharge the battery pack using an appropriate 4S lithium battery charger.

LED Indication Reference

LED Count Charge Level Pack Voltage (Approx.) Action
1 LED ≤ 25% 12.0V – 13.6V Recharge soon
2 LEDs 25–50% 13.6V – 14.8V Monitor
3 LEDs 50–75% 14.8V – 16.0V Good
4 LEDs 75–100% 16.0V – 16.8V Full

Typical Applications

  • RC vehicles — Monitor battery level before and during operation

  • Drone battery packs — Check charge status before flight

  • Electric bicycles — Monitor battery level for range planning

  • Solar battery banks — Monitor battery status in solar storage systems

  • DIY power banks — Monitor battery status in custom portable chargers

  • Portable speakers — Display battery status on audio devices

  • Robotic systems — Monitor battery level for runtime planning

  • Educational projects — Teaching battery management and voltage monitoring

Notes for Business Buyers

  • Essential battery accessory — Provides convenient battery status indication without a multimeter.

  • Simple integration — Connects directly to battery pack terminals with no additional components.

  • Cost-effective — Low unit cost makes it practical for volume production and educational kits.

  • Suitable for bulk purchasing — Ideal for battery pack assemblers, RC hobby shops, e-bike manufacturers, and educational institutions.

Q: What is the 4S 16.8V Lithium Battery Power Display Module used for?

It is a battery capacity display board that monitors the charge level of 4-cell (4S) lithium battery packs and indicates remaining capacity using LEDs.

Q: What batteries are compatible with this module?

It is designed for 4S lithium battery packs with a nominal voltage of 14.8V and full charge voltage of 16.8V.

Q: How many LED levels does the display have?

The display has 4 LED levels indicating approximately 25%, 50%, 75%, and 100% charge.

Q: What color LEDs does this module have?

This module features blue LEDs.

Q: How do I connect the module to the battery pack?

Connect the module’s B+ pad to the battery pack positive terminal and B- pad to the battery pack negative terminal. Observe correct polarity.

Q: Does the module require a separate power supply?

No. The module is powered directly by the battery pack it monitors.

Q: Does it have reverse polarity protection?

Yes. The module includes reverse polarity protection to prevent damage from incorrect connection.

Q: Can I use this module with a 3S or 6S battery pack?

No. This module is specifically designed for 4S (4-cell) 14.8V/16.8V battery packs. For other configurations, a different indicator module is required.

Q: How accurate is the capacity indication?

The LED indication provides an approximate charge level based on battery pack voltage. It is not a precision fuel gauge but is sufficient for general status monitoring.

Q: Can I purchase in bulk for a product development project?

Yes. This module is suitable for both individual users and business purchasing, including battery pack assemblers, RC hobby shops, e-bike manufacturers, and educational institutions.

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