There are places that specialize in fixing I-Products.. Generally they replace the battery (often upgrade) as part of the repair.
HOWEVER, since I do not have any I-Junk. (I have a dislike for Apple the company, The products are good. I don't like the company due to past practices which I'd rather not go into here) I avoid them
I do have some 'droids and on the tablets I have had it is not easy to replace the battery (Possible though, with tools) of course on the phone snap, snap. Tap, replace.
Find an I-Product repair place and ask them.> That would be my suggestion.
NOTE: Never seen a Windows tablet so can not comment on them.