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Li-ion batteries can fail in such a way as to overheat, catch fire, even explode. This has been known from the earliest days of their development, however, and a great deal of effort has gone in to safety features to prevent it. For something like that to happen, there have to be several failures in the design and/or manufacturing, and such defects normally show up when they're new, not when they're worn out.
In other words, if you've had it long enough to wear it out, and it hasn't caught fire yet, it isn't bloody likely to.
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