1S 2S 3S 4S 5S 6S 7S 18650 Li-ion Lipo Lithium 12V Acid Battery Level Indicator Tester LCD Display Meter Module Capacity 100% new and high quality 18650 Li-ion Lithium Battery Level Indicator Li-ion Battery Level Display Parameter: (2% error should be acceptable) battery voltage > N*3.2V, 1 LED lights up (note:N = battery cell number) battery voltage > N*3.4V, 2 LED lights up battery voltage > N*3.6V, 3 LED lights up battery voltage > N*3.8V, 4 LED lights up 12V Lead acid Battery Level Display Range : (4S Lithium iron phosphate battery can be acceptable) battery voltage goes over 11V, 1 LED lights up battery voltage is over 11.6V, 2 LED lights up battery voltage is over 12.3V, 3 LED lights up battery voltage is over 13V, 4 LED lights up 3.7V lithium battery,full charge 4.2V 2S lithium 7.4V battery , full charge 8.4V 3S lithium 12V battery , full charge 12.6V 4S lithium battery , full charge 16.8V 5S lithium battery, full charge 21V 6S Lithium battery ,full charge 25.2V 7S Lithium battery , full charge 29.4V 12V lead acid storage battery , 12V car battery Size: 15*40*2.5MM (L*W*H) Cable Length: 140MM Operaction: Please processing with your fingers lightly press the red button when charge or discharge, when the LED lights, the light board line current is about 30mA. Release the finger, LED lights will go out, light board line off, no current through. Board with reverse function, the line is connected or wrong is no problem, adjust it over A total of 5 small lights, display power, suitable for reverse converter lithium battery power tips 3.7V kind with 1pcs red power Indictor ,4pcs green battery Indictor ;the others with 1pcs red power Indictor ,4pcs blue battery Indictor