Yeah, battery might be defective now but it never was this bad until I basically left it on the charger for 6-12 months of not using it.
ah, it wasnt in use. so it never decharged below like 95% or whenever it starts charging again. then it probably did waste bunch of cycles which certainly could have caused that.
in that case, get a new battery if you can (and get an original one, 3rd party, even if they advertise higher charge, they usually break even quicker)
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my switch is practically never out of it's dock and still running FINE. the wiiu controller has been in it's charging cradle for a whole year now that's still working too
the question is, how long would their charge last if you took them away from the cable now?