The Professional 1S 3.7V Lithium Battery Power Indicator Module is a compact, easy-to-use battery capacity display board designed for monitoring the charge level of single-cell lithium-ion batteries. It provides a clear, visual indication of remaining battery capacity using a row of LEDs, making it an essential accessory for battery-powered projects, DIY power banks, and portable electronics.
The module is specifically designed for 1S (single-cell) 3.7V lithium batteries, including the popular 18650 cells, as well as LiPo pouch cells and other 3.7V lithium chemistries. It continuously monitors the battery 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 needs charging without using a multimeter.
The module features high-brightness LEDs available in blue or green options, providing clear visibility in various lighting conditions. The compact PCB design with mounting holes makes it easy to integrate into battery packs, power banks, and custom enclosures. The module operates directly from the battery it monitors, requiring no separate power supply.
Installation is simple: connect the module’s B+ and B- pads to the battery’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 power indicator module is widely used in DIY power banks, 18650 battery packs, portable speakers, flashlights, RC vehicles, and any application where 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 power bank, maintaining a fleet of 18650 batteries, or adding battery status indication to a portable device, the 1S Lithium Battery Power Indicator 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
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1S lithium battery compatibility — Designed for 3.7V single-cell batteries including 18650 and LiPo
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LED capacity display — Shows charge level at 25%, 50%, 75%, and 100%
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Blue or green LED options — High-brightness LEDs for clear visibility
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Direct battery operation — Powered by the battery it monitors, no separate supply
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Reverse polarity protection — Prevents damage from incorrect connection
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Compact PCB design — With mounting holes for easy integration
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Simple installation — Connect B+ and B- to battery terminals
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Wide application range — Power banks, battery packs, portable devices, educational projects
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | Compatible Battery | 1S 3.7V lithium-ion (18650, LiPo) |
| 2 | Voltage Range | 3.0V – 4.2V |
| 3 | Display Type | LED bar graph (4 levels) |
| 4 | Indication Levels | 25% / 50% / 75% / 100% |
| 5 | LED Color Options | Blue or Green |
| 6 | Power Supply | Powered by monitored battery |
| 7 | Protection | Reverse polarity protection |
| 8 | Module Dimensions | Compact PCB with mounting holes |
