Model # 463240904 ignitor stopped firing even after replacing battery?

First, be sure you have the battery turned the right way. Generally the Positive Tip (+) should be facing up. Yours may be the opposite, so try it both ways. Also, when you remove the battery look inside the holder for signs of corrosion. If there is some, do your best to clean it out with a Q-Tip soaked in WD-40.

If none of the above seems to solve the problem, look for loose wires from the Ignitor button assembly to the Ignitor Elements (Tips) in the grill. Also, the Ignitor Elements at each burner in the grill may be covered with grease, which will prevent them from firing. If you see that, clean them with alcohol.

Those are the basic things that cause a battery operated ignitor to fail.

Hope this helps to solve your problem. Please let me know.