Miniature Battery Level Indicator for 1S 2S 3S 4S Lithium Batteries Accurate for Hobby Projects

Features 1. Compatible with 1S–4S lithium battery series configurations, ensuring high versatility. 2. Provides precise battery percentage for easy and clear readings. 3. Extremely compact, allowing seamless integration into small devices. 4. Consumes low power, enhancing device standby duration. 5. Series configuration can be switched manually for convenience. Parameter Maximum Voltage Rating: 36V ±10% Voltage Measurement Range: 3–17.29V Battery Capacity: Unlimited Battery Level Display: 0%–100% Measurement Precision: ±1% Average Operating Current: 7mA ± 0.3mA Update Interval: 0.3 seconds refresh time Output Control: None Reverse Polarity Protection: None (Reversing terminals will result in module damage) Compatible Battery Spectrum: The module fits all lithium batteries comprising 1 to 4 cells in series or parallel with a rated voltage of 3.7V (4.2V when fully charged), including 14500, 18650, 21700, polymer lithium types, and any capacity or size batteries Model Featuring Smart Button Includes a smart button. Initially, upon power-up, the number of battery cells is detected; default setting is Mode 0. The display activates after about 1 second, exhibiting the current battery percentage. A brief press (under 3 seconds) of the button turns the power on/off; a prolonged press (over 3 seconds) switches modes to Mode 1. In Mode 1, the display default is off. A short button press (within 3 seconds) reactivates the display, rising from 0% to the actual battery level in roughly 1 second, then it automatically shuts off after a 3-second delay. A long press (>3 seconds) enables mode-switching, returning to Mode 0, repeating the cycle. Precautions 1. Connect VCC to the battery's positive and GND to the negative end; as indicated on both sides of the board. Aligning the battery meter, left pads show the top as positive and bottom as negative; 2. Ensure power is off during wiring; unintentional contact with backside pins could short-circuit and harm the module. Post-soldering, inspect positive and negative terminations to ensure they don’t touch the battery meter’s backend pin pads before powering on; 3. No reverse polarity protection exists; incorrect connection of terminals will damage the module. Verify polarity before proceeding with wiring; 4. Incompatible with 3.2V lithium iron phosphate (LiFePO4) or lead-acid batteries. During charging, charger amplification results in an approximately 110% boosted charge level display. The merchant warrants that their products comply with all applicable laws, and are offered only if they comply with Joom's policies and EU Product Safety and Compliance laws.