8 led beacon without microcontroller
You should be able to achieve this using a 555 timer and CD4017 combined with some MOSFETS on the output to switch the higher currents. The two LEDs in parallel will draw 300mA so ensure that your battery is capable of providing this power. The only other problem I can see is that the voltage of the battery may not be high enough to run the electronics so you need to check all that too.

Aby.