1S Lithium Battery Capacity Indicator

Single-Cell (1S) Lithium Calibration: Engineered specifically for 1-cell (1S) 3.7V nominal and 4.2V fully charged lithium-ion, LiPo, and 18650 battery cells.

5-Segment Visual LED Battery Bar Display: Features a clear 4-bar capacity grid surrounded by a battery frame indicator that lights up according to charge level:

3.3V (1 bar): 25% capacity

3.5V (2 bars): 50% capacity

3.7V (3 bars): 75% capacity

3.9V (4 bars): 100% capacity

Ultra-Low Quiescent Power Draw: Draws minimal idle current during operation, conserving your cell's stored energy while providing continuous charge status.

Ultra-Compact PCB Form Factor: Ultra-slim profile allows seamless mounting into tight single-cell housings, portable devices, and custom project enclosures.

Simple Two-Wire Solder Pads: Clearly marked + and - solder points simplify direct wiring across the battery terminals or power switch contacts.

Board Material: High-grade FR-4 glass-reinforced epoxy PCB equipped with surface-mount LED indicators and precision voltage comparator ICs.

Technical Specifications:

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

Display Type: 5-segment LED Bar Graph (Blue/Green/Red options).

Operating Voltage Range: 3.3V – 4.2V DC.

Board Color: Green PCB.

Usage Advice: Connect the positive solder pad (+) to the battery positive terminal and negative (-) to ground; verify correct polarity before applying power.

Maintenance: Keep solder terminals free of flux residue, dust, and moisture to avoid parasitic drain or unintended shorts.

Essential Single-Cell Battery Fuel Gauge: Position as an indispensable charge level display for single-cell 18650 projects, DIY power banks, small robotics, handheld flashlights, and 3.7V IoT gadgets.

Highlight Immediate Visual Feedback: Emphasize how the bright LED bar display gives users instant visual telemetry without requiring a multimeter or complex software.

Recommended Cross-Sell Add-ons: Pair with 2S Lithium Battery Capacity Indicator, 3S Lithium Battery Capacity Indicator, Dual USB 5V 2.1A LED Lithium Battery Charger Protection Board, and ESD antistatic mat 50x40CM PCB Welding Mat.

Featured Collection Star: Display prominently on your Battery Capacity and Voltage Meter collection page as your standard 1S 3.7V lithium capacity indicator.