1S 18650 Lithium Battery Capacity Indicator Module Level Tester LED

1-Series (1S) Lithium Battery Gauge: Designed specifically for single-cell (1S) 3.7V nominal / 4.2V max charge lithium-ion, LiPo, and 18650 battery cells.

4-Level LED Bar Display: Features 4 blue LED segments and 1 red battery outline frame LED to provide instantaneous visual indication of remaining charge percentage (25%, 50%, 75%, and 100%).

Real-Time Voltage Threshold Monitoring:

Battery voltage > 3.3V: 1st bar illuminates (25%).

Battery voltage > 3.5V: 2nd bar illuminates (50%).

Battery voltage > 3.7V: 3rd bar illuminates (75%).

Battery voltage > 3.9V: 4th bar illuminates (100%).

Low Static Power Consumption: Draws minimal quiescent current during operation to prevent unnecessary battery drain while testing.

Ultra-Compact PCB Footprint: Small linear layout with solder terminals (+ and -) for effortless mounting on project enclosures, battery cases, and DIY power supplies.

Board Material: High-grade FR-4 glass-reinforced epoxy PCB equipped with surface-mount resistor array, LED display LEDs, and control comparator IC.

Technical Specifications:

Series Configuration: 1S (1 Cell, 3.7V nominal / 4.2V peak).

Display Type: 5-segment LED bar (1 red outline + 4 blue level indicators).

Working Voltage Range: 3.3V – 4.2V DC.

Board Color: Blue PCB.

Usage Advice: Solder the positive (+) and negative (-) pads directly across the battery leads or through a momentary push-button switch to check capacity on demand.

Maintenance: Keep the board clean, dry, and free of metallic debris to avoid short circuits across the solder pads.

Essential DIY Battery Monitor: Position as a must-have accessory for single-cell lithium projects, power banks, custom 18650 flashlights, RC vehicles, and portable Bluetooth speakers.

Highlight Momentary Testing: Recommend pairing with a tactile push-button switch so users can check remaining battery percentage without keeping the LEDs constantly lit.

Recommended Cross-Sell Add-ons: Pair with 2S 18650 Lithium Battery Capacity Indicator Module Level Tester LED, 3S 18650 Lithium Battery Capacity Indicator Module Level Tester LED, 3.7V Lithium Battery Protection Board for Polymer 18650 Bonding Pad (can Spot/Weld) 3A Overcurrent Value, and ESD antistatic mat 50x40CM PCB Welding Mat.

Featured Collection Star: Display prominently on your LiFePO4 (LFP) Hardware BMS Modules collection page as your standard 1S LED battery level indicator.