If you can charge the battery up using the mains, then hook up a multimeter to the positive terminal of the battery and a good earth spot on the bike (somewhere on the frame), start the bike with all extras like lights off, the voltage should be about 12v. Switch on all the lights, indicators, full beam on headlight etc. on and the voltage should stay up at around 12v. If it starts dropping then it's some problem with your charging system. If I recall correctly throttling up should increase the voltage momentarily before it settles again. Try topping up your battery (unless its maintenance free of course!) and checking the alternator is properly earthed etc. before assuming it's something really bad.
If the bike doesn't start with a fully charged battery then it ain't your charging system.
Matt
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*Disclaimer* - I am not saying my bike is better than your bike. I am not saying my way is better than your way. I am not mocking your religion/politics/other belief system. When reading my post imagine me sitting behind a frothing pint of ale, smiling and offering you a bag of peanuts. This is the sentiment in which my post is made. Please accept it as such!
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