I have yet to have a set have the sealed batteries fail before the set itself is worn to a nub.

Then again, I have had four Shokz (two replaced at the end if their 2-year warranty) over 15 years and had a Sony pair for ten years before that... As they get smaller, lighter they've got limits.
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Stuff with a built-in battery seems like the capacity severely degrades after a few years regardless of how much it is used in my experience
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And removable batteries have a lower capacity to begin with.

There's alot of crap out there, is the problem, and no plan or warranty that matches the life of the batteries.
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