Its a good trick to use if you are travelling and cannot find a battery, even if you have lots of cash. My buddy came part way home one weekend with lantern batteries on his bike, till he got to someone who could fix his 6V generator..
I never found it that amazing, till I joined this forum and people were saying that you need more battery to run the bike, than I have had, on more than one occasion.
If you never had a multimeter, you dont know what you have, if it starts, you keep going.. God protects the ignorant, dontcha know..
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Dont take my word for it, PM 1080, he measured my battery in the last 2 weeks, it was under 7 volts, with indicators brightly lit, and it has been starting in 30 degree weather, when you can barely see the neutral light..