4S 18650 Lithium Battery Capacity Indicator Module Level Tester LED

From the shop's description

4S 18650 12V Lithium Battery Capacity Indicator Module Percent Power Level Tester LED Display Board Module An Intelligent electricity quantity display board; slightly push trigger switch, it will auto power off after 3 seconds display. LED Indication: 25% –>First Light is on (Voltage: 4.2 V) 50% –>Second light is on (Voltage: 8.4 V) 75% –>Third light is on (Voltage: 12.6 V) 100% –>Fourth light is on (Voltage: 16.8V) Features: The intelligent power display panel Static power consumption 2~3 mA, It’s negligible Power indication(The color of the lamp is green) Package Includes: 1 x 4S 18650 Lithium Battery Capacity Indicator Module Level Tester LED Item Type: Battery Testing Equipment Model: Battery Level Indicator/Monitor Voltage Rating (V): 12 to 16.8 Compatibility: Lithium Battery Current consumption (mA) 2~3 mA Additional Specs.: 25% LED Indicator U≈7V 50% LED Indicator U≈7.5V 75% LED Indicator U≈8V 100% LED Indicator, U≈6.6V Length (mm): 44 Width (mm): 9 Height (mm): 7.5 Weight (g): 8 Shipping Weight 0.01 kg Shipping Dimensions 5 × 1 × 1 cm