There are amateurs who do try to re-cell LiIon batteries, but the success rate is poor, and what they risk is real and serious injury. As well as potential explosion, with effects like blindness, there is the danger of starting a chemical fire.

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Psssh, haven't you read the news lately? Or within the last 12 years? LiIons are prone to doing that sort of thing WITHOUT being tampered with.

But yeah, I concur, recelling LiIons isn't a good idea for the average hobbyist, because buying a replacement is (usually) 100% guaranteed to work, won't look like someone ran over it with a truck, and they typically have a warranty in case they do decide to explode. If you're lucky, they'll be recalled, too, so you get a free replacement battery in the future. So yeah, it's safer and more cost-effective to just buy a replacement.