Sounds like your battery isn't being charged at all when the bike is running. Do this simple check first. Get the bike started either by bump start or jump leads from another vehicle, then switch your headlight onto dip beam with the light facing a wall or similar. Rev the engine and watch the headlight beam to see if it brightens up as you are revving the engine. If it doesn't then this would suggest a faulty rectifier or alternator. Another test is to put the probes of a voltage tester set to DC across the battery terminals, start the engine and rev the engine and look at the meter to see if the voltage on the meter rises. It should rise to 13.5-14.2 volts when you rev the engine anywhere above 3000 revs. If no increase then there is definitely a fault with the alternator/rectifier. If you know of a good auto electrician, he/she should be able to diagnose the problem. It could also be as simple as a loose or disconnected terminal in the ignition circuit, but I'm afraid I haven't the know-how of electronics to help you in that area. Let us know if you find anything? Good luck!