3.7V 2S 3S 4S 18650 Li-ion Lipo Lithium 12V Lead Acid Battery Level Indicator Tester LCD Display Meter Module Capacity Voltage and high quality Features: Ultra-thin power display, 5 LED indicators, the display is more intuitive and visually appealing. Suitable for a wide range of applications including lithium batteries, lead-acid batteries, lithium iron phosphate, and electric vehicles. Li-ion Battery Level Display Parameters: (2% error is acceptable) - Battery voltage > N*3.2V, 1 LED lights up (Note: N = number of battery cells) - Battery voltage > N*3.4V, 2 LEDs light up - Battery voltage > N*3.6V, 3 LEDs light up - Battery voltage > N*3.8V, 4 LEDs light up 12V Lead Acid Battery Level Display Range: (Compatible with 4S lithium iron phosphate battery) - Battery voltage > 11V, 1 LED lights up - Battery voltage > 11.6V, 2 LEDs light up - Battery voltage > 12.3V, 3 LEDs light up - Battery voltage > 13V, 4 LEDs light up Voltage Reference: - 3.7V lithium battery, fully charged at 4.2V - 2S lithium battery, 7.4V, fully charged at 8.4V - 3S lithium battery, 12V, fully charged at 12.6V - 4S lithium battery, fully charged at 16.8V - 12V lead acid battery, standard car battery Instructions: 1. Connect the positive and negative terminals of the display module to the corresponding terminals of the battery being tested. Press the red button to activate the LED display and view real-time battery level. 2. Release the button; the display will turn off after 3–5 seconds. No power is consumed when idle. 3. Includes reverse polarity protection—will not be damaged if connected backward; simply correct the connection. Tips: - Total of 5 indicator lights for power level indication, suitable for use with lithium batteries in inverters or similar applications. - For 3.7V version: 1 red power indicator and 4 green battery indicators. Other versions include 1 red power indicator and 4 blue battery indicators. Specifications: - Compatible Types: 3.7V 1S lithium battery, 2S lithium battery, 3S lithium battery, 4S lithium battery, 12V lead acid battery (12V car battery) - Material: PCB board - Dimensions: 40 x 15mm (1.57 x 0.59 inches) - Cable Length: 120mm - Color: Black - Quantity: 1 piece Note: - Please allow 0–3mm measurement deviation due to manual measurement. - Due to differences in monitor displays, actual product color may vary slightly from images. Package Includes: 1 x Battery Capacity Indicator Module