5Pcs 1S Mini LED Battery Level Display Board 3.7-4.2V 1S Lithium Capacity Meter Cable-Free Bare PCB Indicator

Semi-finishedproduct : No High-concerned chemical : none Electronic : No DIY Supplies : Electrical Brand Name : Stlxy Origin : Mainland China

Applicable battery cell: 1S single string 3.7V ternary lithium battery, operating voltage range 3.7V~4.2V ️ Not for use with 3.2V lithium iron phosphate batteries Display mode: 4-segment LED shows remaining battery level, with voltage level reference 4.20V ~ 3.95V: All 4 lights on (full charge) 3.95V ~ 3.75V: 3 lights illuminate 3.75V ~ 3.55V: 2 lights illuminate 3.55V ~ 3.30V: 1 light turns on (low battery warning) ```<3.30V: All indicator lights are off``` Product Form: Miniature bare board, without lead-out connecting wires; reserved B+ and B- pads for direct soldering/spot welding of battery cells Static power consumption: Microampere-level standby current, long-term parallel connection across the battery terminals, unlikely to cause battery cell discharge Installation advantages: The PCB has a compact size and can be directly embedded into the interior of 18650 battery compartments, power banks, or small portable device casings Working Principle: Estimates remaining battery capacity through voltage sampling, eliminating the need for microcontrollers or programming—simply power on to operate Wiring method: Simply connect the two terminals of the lithium battery in parallel for operation, no additional peripheral components required

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Battery capacity: 43200 Charge indicator: No Number of ports: 1 port Voltage: 1.5