LM3914 10-Segment Battery Capacity Indicator Module LED Bar

Monitor your battery levels at a glance with the LM3914 10-Segment Battery Capacity Indicator Module. Designed for makers, hobbyists, and electronics enthusiasts, this compact module provides a clear, real-time visual readout of battery charge levels using a 10-LED bar or dot display. Whether you're building a custom power monitoring system or adding a charge indicator to your DIY project, this module delivers reliable, precise readings every time.

Key Features

• 10-Segment LED Display: Instantly visualize battery charge level with a bright 10-LED bar graph or single-dot display mode
• Wide Measurement Range: Compatible with universal 2.4V–20V batteries, including 3.7V lithium, 12V lead-acid, and more
• Dual Display Modes: Switch between multi-light bar strip display (42mA) or energy-efficient single-light dot display (4mA)
• Adjustable Design: Fully customizable output thresholds to suit a wide variety of battery types and project requirements
• Compact PCB Form Factor: Small 2.6 × 4.9 cm board fits easily into enclosures or custom builds
• Wide Operating Temperature: Rated for use from -40°C to +85°C — suitable for demanding environments
• Low Supply Voltage: Operates at 3.7V supply, ideal for battery-powered builds
• SMD Package: Surface-mount design for clean, professional-looking PCB integration
• LED Color Options: Available in green or mixed color (random assortment)

Specifications

Perfect For

• DIY battery monitoring projects
• Lithium-ion and lead-acid battery charge indicators
• RC vehicles, solar power systems, and portable power banks
• Arduino, Raspberry Pi, and custom electronics builds
• Robotics and maker projects

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Learn more: EPA guidance on lithium-ion battery handling

Frequently Asked Questions

Q: What battery types is the LM3914 10-Segment Battery Capacity Indicator Module compatible with?

A: This LM3914 module is compatible with a wide range of battery types, including 3.7V lithium-ion, 12V lead-acid, and virtually any battery with a voltage between 2.4V and 20V. Its adjustable threshold design makes it highly versatile for different battery chemistries and project needs.

Q: What is the difference between bar display mode and dot display mode?

A: In bar display mode, all LEDs up to the current charge level illuminate simultaneously, giving you a clear bar-graph readout — this mode draws approximately 42mA. In dot display mode, only a single LED lights up to indicate the charge level, which is much more energy-efficient at just 4mA, making it ideal for battery-powered applications where conserving power is important.

Q: How do I connect the LM3914 Battery Indicator Module to my project?

A: The module connects directly to your battery's positive and negative terminals for voltage sensing, and requires a 3.7V supply voltage to operate. The PCB's compact 2.6 × 4.9 cm footprint makes it easy to integrate into custom enclosures or mount on a breadboard. Refer to the LM3914 datasheet for detailed wiring and threshold adjustment guidance.

Q: Can I adjust the voltage measurement range on this module?

A: Yes — the LM3914 module features an adjustable design, allowing you to calibrate the upper and lower voltage thresholds to match your specific battery type. This makes it suitable for a broad range of applications, from small single-cell lithium packs to larger 12V lead-acid systems.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.