output of comparator
The LM139 has an "open collector" output stage.
It can pull its output low but cannot pull it high.
As a consequence it cannot drive Q1 base high.
Place a (say) 10k resistor from Q1 base to V+

The LM741 is NOT a single supply opamp. It is not clear where you intend ground to be relaative to Vbat+ and Vbat-. IF the battery was centre tapped (+/- 6V) the opamp would work but not be well suited to the task.
If V12- is connected to ground the opamp will not work.
The LM741 is very very old and there is very little reason to use one nowadays.
instead consider using the only veru old LM324 quad or LM358 dual single supply opamp. (They are effectively a single supply '741 with internal compensation).
Or use some even better modern opamp.

If LED1 is a white LED then it's current will be about
I_LED1 ~= (Vbat-V_LED)/R5
= (9-3)/50 = 120 mA.
Did you intend to have that order of LED current?

If you use an LM324 or LM358 you can use one section in place of the LM139. In many cases it will be just as good and makes the whole design easier and "nicer".