I had a '96 Ninja 250 that I acquired off a young fellow a couple years ago for free that I did some electrical work for that same year, I think around this time of the year (August), the battery died and left me stranded. Won't ever forget it, I had to go home, get my giant truck with my giant trailer and load it on up, because no one happened to have a battery for it. Best of all it won't run by itself, because of the ignition system relying on the battery's capacitive effect to smooth the voltage off the stator.
After I got home, I realized I had some 16ah UPS batteries sitting around at my shop, I could've modified one to work.
Did I lose faith in that bike? Nope... just learned a valuable lesson -- check your battery! Then again, it wasn't the bike's fault.