LED Charge Level Indicator – Monitor Li-ion Batteries from 1 to 8 Cells

Compact Module for Visualizing Battery Pack Capacity for E-bikes, Scooters and DIY Projects

The 1S-8S Battery Capacity Indicator Module is a compact electronic display module designed to visually indicate the charge level (state of battery voltage) of lithium-ion or lithium-polymer battery packs ranging from 1 to 8 cells in series (1S–8S). It uses a simple LED bar indicator to show the approximate remaining charge, making it useful for a wide range of applications such as DIY battery packs, RC hobby electronics, e-bikes, power stations, and portable devices.

 Key Features

• Supports 1S to 8S batteries: suitable for single to eight-cell Li-ion / Li-Po packs (~3.7 V to ~33.6 V total).

• LED bar display: typically a 4-segment visual indicator showing relative charge level.

• Operating voltage: approximately 3 V – 34 V DC to cover 1S–8S ranges.

• Easy to connect: just connect the + (positive) and – (negative) terminals to your battery or battery pack.

• Operating temperature: approximately -20 °C to +50 °C depending on the module.

• Compact form factor: lightweight and easy to integrate into projects or enclosures.

 How It Works

The module senses the total pack voltage and lights different numbers of LEDs based on thresholds corresponding to common Li-ion cell voltage levels:

• 1 LED on: battery voltage > N × ~3.3 V

• 2 LEDs on: battery voltage > N × ~3.5 V

• 3 LEDs on: battery voltage > N × ~3.7 V

• 4 LEDs on: battery voltage > N × ~3.9 V

• No LEDs: voltage < N × ~3.3 V — indicates low battery.

 Applications

•  E-bikes & scooters: monitoring battery pack charge.
•  RC hobby use: checking Li-ion battery packs in drones and RC vehicles.
•  DIY battery builds: visual charge indicators in custom battery systems.
•  Portable devices: quick glance battery level check.