when my recent woo died I had a suspicion that it could be moisture related.
a hint was ,that it would actually start working for a few minutes after spending 20 minutes in a freezer..
So I decided to crack it open and see if it could be salvaged.
there are 4 screws that would need to be opened or drilled though..
then you should be able (with some effort) to open the back lid and get to the electronics, connectors and battery..
the internals are not sealed in epoxy so they are easy to pull out, clean up and dry
and after that it started to charge and work as expected...
hope it helps to others..