Any battery Voltage indicator

Hello friend, today in this video i have shown how to make a simple battery voltage indicator using ic 3914 and a few resistor. You can use it in any battery from 4.2V li-ion to 12V lead-acid battery. The full charge voltage threshold is set by 68k resistor and the 10K preset. And the lower limit is set by 47K resistor. I don't have a battery voltage monitor for my quadcopter. So I'm going to use it in my quadcopter to indicate the voltage of 3s lipo battery. I have set the max voltage at 12.6V and low volt