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Recently I've been going through my collection of consoles (as in, clones, plug n plays, all in one handhelds, emu machines, not the "proper" ones) taking an inventory and also checking on the batteries... Found two swollen ones so far
The interesting thing though is both of those are aftermarket replacements that I bought to replace low capacity originals (these consoles often use Nokia or GBASP battery clones so easy to replace), none of the originals seem to have gone bad so far
My working theory is the replacements were a) probably old stock from the 2000s so aging more and b) more likely to have a decent capacity so more battery juice to go bad
Whereas the ones bundled with the cheap consoles would be newly manufactured but probably mostly lemon juice and toilet paper inside