module things, jfc

code/modules/power/lighting.dm

@@ -345,6 +345,7 @@
 	else if(has_emergency_power(LIGHT_EMERGENCY_POWER_USE) && !turned_off())
 		use_power = IDLE_POWER_USE
 		emergency_mode = TRUE
+		START_PROCESSING(SSmachines, src)
 	else
 		use_power = IDLE_POWER_USE
 		set_light(0)
@@ -361,7 +362,11 @@
 
 
 /obj/machinery/light/process()
-	if(has_power() && cell)
+	if (!cell)
+		return PROCESS_KILL
+	if(has_power())
+		if (cell.charge == cell.maxcharge)
+			return PROCESS_KILL
 		cell.charge = min(cell.maxcharge, cell.charge + LIGHT_EMERGENCY_POWER_USE) //Recharge emergency power automatically while not using it
 	if(emergency_mode && !use_emergency_power(LIGHT_EMERGENCY_POWER_USE))
 		update(FALSE) //Disables emergency mode and sets the color to normal