4S Li-Ion/Li-Po Battery Charge Level Indicator with LED Display

4S Li-Ion/Li-Po Battery Charge Level Indicator with LED Display

A compact battery charge level indicator module for accurate monitoring of 4S Li-Ion and Li-Po packs. The device is ideal for applications that require continuous voltage tracking from 13.2 V to 16.8 V. Equipped with a clear 4-bar LED display, it allows quick assessment of available energy.

Key technical specifications

• Measurement range: 13.2 - 16.8 V
• Power supply: directly from the measured source
• LED indicator: 4-bar, graphic
• Refresh rate: 500 ms / reading
• Operating temperature: from -10°C to 65°C
• Dimensions: 44 x 20 x 9.2 mm
• Bar backlight color: blue
• Battery outline backlight color: red

Charge levels on the display

The indicator automatically changes the number of lit bars depending on the currently measured pack voltage:

• Below 13.2 V: 0 bars
• 13.2 V - 14.0 V: 1 bar
• 14.0 V - 14.8 V: 2 bars
• 14.8 V - 15.6 V: 3 bars
• Above 15.6 V: 4 bars

Example applications

• Monitoring power status in RC models and drones
• Checking packs in portable audio systems
• Charge indicator in 4S battery-powered power tools
• Emergency power systems and mobile power stations
• DIY projects and robotics (for Arduino, ESP8266, ESP32, Raspberry Pi)

Benefits

• Instant readout of battery status thanks to contrasting colors
• Easy installation in any enclosure thanks to compact dimensions
• No need for a separate power supply - the module draws power directly from the measured source
• High reliability and measurement stability across a wide temperature range
• Attractive appearance that looks professional in finished projects