The 1S 18650 Lithium Battery Capacity Indicator Module is a compact LED-based level tester designed to visually display the remaining charge of a single-cell (1S) lithium battery. Using a simple 4-level LED bar display, it provides an instant indication of battery status, making it ideal for portable devices, DIY battery packs, power banks, and energy storage projects. The module is easy to integrate and offers reliable monitoring of lithium cell voltage.

Features:

1. LED bar indicator for real-time battery level display
2. Designed for single-cell (1S) 3.7V lithium batteries
3. Four-step LED indication for different charge levels
4. Compact and easy to integrate with DIY battery packs
5. Low power consumption
6. Useful for power banks, small electronics, and lithium battery projects

Specifications:

• Input Voltage: 3.0V – 4.2V (single Li-ion cell)
• Battery Type: 1S 18650 / Li-ion / LiPo (3.7V nominal)
• Display Type: 4-level LED bar indicator
• LED Indication Range (Approx.):

  • 4 LEDs ON: ≥ 4.0V (Full)

  • 3 LEDs ON: ~3.85V

  • 2 LEDs ON: ~3.65V

  • 1 LED ON: ~3.45V (Low)

  • < 3.3V: Battery very low

• Module Type: Voltage-based battery level tester
• Power Consumption: Very low
• Dimensions: Compact small PCB 
• Operating Temperature: –10°C to +60°C
• Applications: Power banks, battery packs, DIY electronics, portable devices

Package Includes:

1 × 1S 18650 Lithium Battery Capacity Indicator Module - LED Level Tester