ITEM NAME:LM3914 10 Segment 5V 12V LED Indicator Battery Capacity Level Display Power I3Q4 Description&Preview.4S correspond to 12V (first light) to 16.8V (tenth lights);. 1S correspond to 3V (first light) to 4.2V (tenth lights);. 2S corresponds to 6V (first light) to 8.4V (tenth lights);. 3S correspond to 9V (first light) to 12.6V (tenth lights);.