1S 2S 3S 4S Lithium Battery Capacity Indicator Voltmeter Module - Blue Display

📋 Overview

Know the charge level of your lithium battery pack at a glance — no meter probes, no math. This compact battery capacity indicator connects directly to the positive and negative terminals of your 1S, 2S, 3S, or 4S lithium-ion battery pack and instantly displays its charge state as a real-time LED bar graph.

Choose the model that matches your battery configuration: 1S (4.2V), 2S (8.4V), 3S (12.6V), or 4S (16.8V). Each module is pre-calibrated for its specific battery voltage range, with a bold red display outline and bright blue LED bars for easy visibility even in low-light conditions.

Whether you're building a DIY power bank, monitoring an e-bike battery, or checking charge on an RC vehicle pack, this indicator gives you an instant visual snapshot with no setup required — just connect and go.

⭐ Key Features

• Works with 1S, 2S, 3S, and 4S lithium-ion and lithium polymer battery packs
• Real-time charge level displayed as a 4-segment blue LED bar graph
• Available in four voltage variants: 4.2V, 8.4V, 12.6V, and 16.8V (select at order)
• Simple 2-wire connection — positive and negative only, no programming needed
• Compact and lightweight — fits easily in portable builds and enclosures
• Red display outline with blue LED bars for high contrast and easy readability
• Low battery alert: all bars off when battery voltage falls below minimum threshold

📊 Specifications

📌 How the Bar Display Works

The LED bar graph uses four segments to indicate charge level. The voltage thresholds below apply per cell — multiply by the number of cells in your pack (N = number of cells: 1, 2, 3, or 4):

🔌 Wiring / Connections

Connecting the module is straightforward — just two wires:

• Connect the positive (+) wire to the positive terminal of your battery or battery pack
• Connect the negative (–) wire to the negative terminal of your battery or battery pack

Important: Make sure you order the correct variant for your battery pack. Connecting a 1S module to a 4S battery pack (or any other mismatch) will result in inaccurate readings and may damage the module. Check the maximum voltage of your pack before purchasing.

🎯 Applications

• DIY power banks and portable battery packs
• E-bikes and electric scooters
• RC cars, boats, and aircraft
• Solar energy storage monitoring
• Battery-powered tools and equipment
• Robotics and automation projects
• Prototype and laboratory power supplies

📦 What's in the Box

• 1× Lithium Battery Capacity Indicator Voltmeter Module (1S, 2S, 3S, or 4S — as selected)

💡 Tips

Tip: The module draws a small amount of current continuously while connected. If storing your battery pack for an extended period, disconnect the indicator to prevent slow discharge over time.

Note: This module displays approximate charge level based on voltage thresholds — it is not a precision coulomb counter. For critical applications requiring exact state-of-charge measurement, use a dedicated battery management system (BMS).

📄 Documentation & Resources

Sold and supported by . Ships from the USA. For wiring diagrams, sample code, and troubleshooting, see the User Guide tab on this product page. The manufacturer and Envistia LLC (dba Envistia Mall) are not responsible for any damages or losses resulting from the use of this product. Always follow proper electrical safety practices when working with electronic components. Specifications are based on manufacturer data and are subject to change without notice.