Battery discharge status indication circuit 2

When the battery voltage is in the range of 7 to 12.6V, the light-emitting diode VLi lights up and its brightness
is almost unchanged. If the battery voltage drops below 7V, the light-emitting diode VLi starts to glow red, and at the same time
the brightness of the light-emitting diode, L2, decreases. When the two LEDs have the same brightness, it means the battery should be charged or replaced. When the battery
voltage is in the range of 2. 5 ~ 6V, VLz turns red, indicating that the battery voltage is lower than the normal value.
  Appropriate selection of each resistor and voltage regulator tube of the indicator can adapt to the monitoring needs of different battery voltages.