Primary Features: 1. Applicable with 1S–4S lithium-ion battery connections, offering extensive compatibility 2. Offers battery percentage display for immediate readability 3. Ultra-compact design fits neatly in small devices 4. Consumes minimal power, prolonging device's standby time 5. Simple manual string count switch, providing ease of use KBAB0066-001/KBAB0066-002 (variants with/without buttons) Technical Data Maximum voltage handling: 36V±10 Voltage range: 3~17.29V Unlimited battery capacity Battery status representation: 0% to 100% Detection precision: ±1% Average current usage: 7mA±0.3mA Refresh rate: 0.3 seconds each instance No output management Lacks reverse polarity protection (Ensure terminals are connected correctly to prevent damage) Suitable battery range: Compatible with all 1~4 lithium-ion battery setups rated at 3.7V (full voltage at 4.2V), whether in series or parallel, including 14500, 18650, 21700, polymer lithium-ion types, and all capacities and sizes. Model with button feature Integrated smart buttons, immediately determines cell count on activation, preset to mode 0. Screen activates around 1 second after power-up, indicating current battery percentage. Short press (under 3 seconds) enables/disables device, long press (over 3 seconds) transitions between modes to mode 1. Mode 1 by default keeps display off. A brief button press (under 3 seconds) awakens the screen, numbers rise from 0% to actual battery level in about 1 second (Button function sharing necessitates filter capacitor charge upon activation). Display turns off automatically after 3 seconds delay. Long press returns setting to mode 0, cycle repeats; KBAB0066-003 (Parallel 4.2V configuration) Specifications Maximum voltage endurance: 36V±10 Voltage window: 3~4.41V Battery capacity: Unrestricted Battery scale display: 0% to 100% Precision rate: ±0.25% Regular operating current: 7mA±0.3mA Frequency of update: 0.3-second intervals Absence of output control No reverse polarity protection (Incorrect terminal connection risks damage) Relevant battery scope: Caters to single lithium-ion cells or parallel arranged battery packs rated at 3.7V (full charge at 4.2V), covering 14500, 18650, 21700, polymer-li-ion types of any capacity/size. The module exhibits battery percentage shortly after activation. Safety Notes: 1. VCC applies to positive terminal, GND to negative terminal.