This module can be used for detecting the battery level of up to 4 strings of 3.7V lithium batteries. It displays in four segments of 100% -75% -50% -25% through 4 red LEDs. To facilitate observation of the battery level, when the measurement button of the module is pressed, the indicator light will remain on for 2-6 seconds (the lower the input voltage, the shorter the duration).
By soldering the jumper pads on the module, the module can switch between 1-4 strings. Simply connect the positive and negative terminals of the battery to the module's input positive and negative interfaces with two wires, making it easy to use.
Short circuit the 1st, 2nd, and 3rd jumper pads to display the battery level of a 3.7V lithium battery in one string;
Short circuit the 2 and 3 jumper pads to display the battery level of the 3.7V lithium battery in two strings;
Short circuit 3 jumper pads to display 3.7V lithium battery power in 3 strings;
The non short circuited jumper pad displays the battery level of a 3.7V lithium battery in 4 strings;

Parameter
1. Power supply voltage: 1 string 4.2V; 2 strings 8.4V; 3 strings 12.6V; 4 strings 16.8V
2. Static power consumption: ≈ 0
3. Maximum operating current: ≈ 6.3mA (when 4 strings are fully charged)
4. Continuous illumination time of indicator light: 2S-6S (the lower the input voltage, the shorter the duration)
5. Scope of application: 1-4 strings of 3.7V lithium batteries

When using the module, strictly connect the positive and negative poles marked on the module to the battery. Do not connect the positive and negative poles in reverse, as it may burn out the module;
Due to differences in components, there may be an error of up to 0.03V in the actual battery voltage corresponding to certain module indicator lights;
When measuring a 3.7V lithium battery in a string, the indicator light goes out and then flashes slightly, which is a normal phenomenon (low brightness)