The 7S 29.4V Lithium Battery Power Display Module is a compact, easy-to-use battery capacity indicator designed specifically for 7-cell (7S) 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, electric vehicles, energy storage systems, and portable electronics.
The module is designed for 7S lithium battery packs with a nominal voltage of 25.9V and a full charge voltage of 29.4V. 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, e-bike frames, 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 7S power indicator module is widely used in electric bicycles, electric scooters, energy storage systems, solar battery banks, electric motorcycles, robotic systems, and any application where 7S 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 7S battery pack, maintaining an e-bike battery, or adding battery status indication to an energy storage system, the 7S 29.4V 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
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7S lithium battery compatibility — Designed for 7-cell 25.9V/29.4V battery packs
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LED capacity display — Shows charge level at 25%, 50%, 75%, and 100%
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Blue LED option — High-brightness blue LEDs for clear visibility
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Direct battery operation — Powered by the battery pack it monitors
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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 pack terminals
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Wide application range — E-bikes, e-scooters, energy storage, solar, electric motorcycles
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | Compatible Battery | 7S lithium-ion (25.9V nominal / 29.4V full) |
| 2 | Voltage Range | 21.0V – 29.4V |
| 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 |
