4 Power Indicator Battery Detection Module

Overview

A 4 Power Indicator Battery Detection Module is a simple circuit used to display battery charge level using 4 LEDs.

It gives a quick visual indication like:

• Low battery

• Medium level

• Full charge

Commonly used in battery-powered projects and DIY electronics.

Working Principle

• The module monitors battery voltage

• Uses voltage comparators / resistor divider network

• Each LED turns ON at a specific voltage threshold

As battery voltage increases more LEDs glow

Example (Li-ion battery):

• 1 LED Low (~3.3V)

• 2 LEDs Medium

• 3 LEDs Good

• 4 LEDs Full (~4.2V)

4-LEVEL BATTERY INDICATOR Function: Battery level Voltage: 3.3V 5V (typ.) Output: 4 LEDs Levels: 25% / 50% / 75% /100% Type: Voltage detection Instant display

Pin Configuration (Typical)

Battery Indicator VCC Battery + GND Battery -

Some modules may also include:

• EN (Enable pin)

• Test button

Key Specifications

• Operating Voltage: 3V 5V (depends on model)

• Battery Type: Li-ion, LiPo, or general DC

• Output: 4 LED indicators

• Accuracy: Approximate (not precise measurement)

• Current Consumption: Very low

Key Features

• Instant battery level indication

• Simple LED display (no coding needed)

• Low power consumption

• Easy to connect

• Very low cost

Applications

• Power banks

• Robotics projects

• RC vehicles

• Portable devices

• DIY battery monitoring systems

• UPS / backup systems

LED Indication Ta Medium (~50%) 3 LEDs Good (~75%) 4 LEDs Full (100%)

Interfacing

No microcontroller required Directly connect to battery

Optional:

• Use with Arduino to trigger alerts when battery is low

Important Notes

• Not highly accurate (only approximate levels)

• Designed for specific battery types (e.g., 18650 Li-ion)

• Wrong voltage range incorrect readings

• Continuous use may slightly drain battery

Battery Indicator vs Battery Management System (BMS)

Pro Tip

For better battery systems:

• Use Battery Indicator + BMS module

You get: Safety (overcharge/discharge protection) Visual battery status