Good example by Mark: Flat tires? Happens rarely, right?
Learn how to change/fix it, and carry your tools, including a pump, and it's an inconvenience, a minor hassle.
Depend on your phone, credit card and the help of strangers? It could easily be hours, or even days and a fair amount of cash to get back in motion.
Back on the topic of batteries: don't set off without a fairly new (but proven) battery. Replace it on the road, if it shows any signs of weirdness. I don't wear my tires to the cords, and I don't wait for battery failure to replace them either.
....................shu
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